diff --git a/impeller/aiks/aiks_playground_inspector.h b/impeller/aiks/aiks_playground_inspector.h
index 10a3d4284d727..297fb16b64e69 100644
--- a/impeller/aiks/aiks_playground_inspector.h
+++ b/impeller/aiks/aiks_playground_inspector.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_IMPELLER_AIKS_AIKS_PLAYGROUND_INSPECTOR_H_
+#define FLUTTER_IMPELLER_AIKS_AIKS_PLAYGROUND_INSPECTOR_H_
+
 #include <functional>
 #include <optional>
 
@@ -48,3 +51,5 @@ class AiksInspector {
 };
 
 };  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_AIKS_PLAYGROUND_INSPECTOR_H_
diff --git a/impeller/compiler/shader_bundle.h b/impeller/compiler/shader_bundle.h
index 672fdc9103f9f..abdf528ec5f31 100644
--- a/impeller/compiler/shader_bundle.h
+++ b/impeller/compiler/shader_bundle.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_IMPELLER_COMPILER_SHADER_BUNDLE_H_
+#define FLUTTER_IMPELLER_COMPILER_SHADER_BUNDLE_H_
+
 #include "impeller/compiler/source_options.h"
 #include "impeller/compiler/switches.h"
 #include "impeller/shader_bundle/shader_bundle_flatbuffers.h"
@@ -33,3 +36,5 @@ bool GenerateShaderBundle(Switches& switches);
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_SHADER_BUNDLE_H_
diff --git a/impeller/renderer/backend/gles/test/mock_gles.h b/impeller/renderer/backend/gles/test/mock_gles.h
index 07051095704e6..d498e959145d2 100644
--- a/impeller/renderer/backend/gles/test/mock_gles.h
+++ b/impeller/renderer/backend/gles/test/mock_gles.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_TEST_MOCK_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_TEST_MOCK_GLES_H_
+
 #include <memory>
 #include <optional>
 #include "fml/macros.h"
@@ -60,3 +63,5 @@ class MockGLES final {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_TEST_MOCK_GLES_H_
diff --git a/impeller/renderer/backend/vulkan/gpu_tracer_vk.h b/impeller/renderer/backend/vulkan/gpu_tracer_vk.h
index c8ffef7eaaac5..a17241549b61c 100644
--- a/impeller/renderer/backend/vulkan/gpu_tracer_vk.h
+++ b/impeller/renderer/backend/vulkan/gpu_tracer_vk.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_GPU_TRACER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_GPU_TRACER_VK_H_
+
 #include <memory>
 #include <thread>
 
@@ -115,3 +118,5 @@ class GPUProbe {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_GPU_TRACER_VK_H_
diff --git a/impeller/renderer/texture_mipmap.h b/impeller/renderer/texture_mipmap.h
index b45dac25d1ddc..a968c2382fdcb 100644
--- a/impeller/renderer/texture_mipmap.h
+++ b/impeller/renderer/texture_mipmap.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef FLUTTER_IMPELLER_TEXTURE_MIPMAP_H_
-#define FLUTTER_IMPELLER_TEXTURE_MIPMAP_H_
+#ifndef FLUTTER_IMPELLER_RENDERER_TEXTURE_MIPMAP_H_
+#define FLUTTER_IMPELLER_RENDERER_TEXTURE_MIPMAP_H_
 
 #include "flutter/fml/status.h"
 #include "impeller/core/texture.h"
@@ -20,4 +20,4 @@ namespace impeller {
 
 }  // namespace impeller
 
-#endif  // FLUTTER_IMPELLER_TEXTURE_MIPMAP_H_
+#endif  // FLUTTER_IMPELLER_RENDERER_TEXTURE_MIPMAP_H_
diff --git a/lib/gpu/fixtures.h b/lib/gpu/fixtures.h
index 338c255450b59..acd936ddd045e 100644
--- a/lib/gpu/fixtures.h
+++ b/lib/gpu/fixtures.h
@@ -2,12 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_LIB_GPU_FIXTURES_H_
+#define FLUTTER_LIB_GPU_FIXTURES_H_
+
 #include "impeller/core/shader_types.h"
 
 struct FlutterGPUUnlitVertexShader {
   struct PerVertexData {
     impeller::Point position;  // (offset 0, size 8)
-  };                           // struct PerVertexData (size 8)
+  };  // struct PerVertexData (size 8)
 
   static constexpr auto kInputPosition = impeller::ShaderStageIOSlot{
       // position
@@ -46,7 +49,7 @@ struct FlutterGPUTextureVertexShader {
     impeller::Vector3 position;      // (offset 0, size 12)
     impeller::Point texture_coords;  // (offset 12, size 8)
     impeller::Vector4 color;         // (offset 20, size 16)
-  };                                 // struct PerVertexData (size 36)
+  };  // struct PerVertexData (size 36)
 
   static constexpr auto kInputTextureCoords = impeller::ShaderStageIOSlot{
       // texture_coords
@@ -107,3 +110,5 @@ extern unsigned char kFlutterGPUTextureVertIPLR[];
 
 constexpr unsigned int kFlutterGPUTextureFragIPLRLength = 800;
 extern unsigned char kFlutterGPUTextureFragIPLR[];
+
+#endif  // FLUTTER_LIB_GPU_FIXTURES_H_
diff --git a/lib/gpu/formats.h b/lib/gpu/formats.h
index 0b3001a8daf24..8c703032adf30 100644
--- a/lib/gpu/formats.h
+++ b/lib/gpu/formats.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_LIB_GPU_FORMATS_H_
+#define FLUTTER_LIB_GPU_FORMATS_H_
+
 #include "fml/logging.h"
 #include "impeller/core/formats.h"
 #include "impeller/core/shader_types.h"
@@ -500,3 +503,5 @@ constexpr impeller::StencilOperation ToImpellerStencilOperation(int value) {
 
 }  // namespace gpu
 }  // namespace flutter
+
+#endif  // FLUTTER_LIB_GPU_FORMATS_H_
diff --git a/lib/ui/painting/image_decoder_no_gl_unittests.h b/lib/ui/painting/image_decoder_no_gl_unittests.h
index 145771e3062b2..0376f6a2cd72c 100644
--- a/lib/ui/painting/image_decoder_no_gl_unittests.h
+++ b/lib/ui/painting/image_decoder_no_gl_unittests.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_LIB_UI_PAINTING_IMAGE_DECODER_NO_GL_UNITTESTS_H_
+#define FLUTTER_LIB_UI_PAINTING_IMAGE_DECODER_NO_GL_UNITTESTS_H_
+
 #include <stdint.h>
 
 #include "flutter/impeller/core/allocator.h"
@@ -99,3 +102,5 @@ float DecodeBGR10(uint32_t x);
 
 }  // namespace testing
 }  // namespace flutter
+
+#endif  // FLUTTER_LIB_UI_PAINTING_IMAGE_DECODER_NO_GL_UNITTESTS_H_
diff --git a/lib/web_ui/skwasm/skwasm_support.h b/lib/web_ui/skwasm/skwasm_support.h
index 0c9cbaaa845c8..ce36a192a69b6 100644
--- a/lib/web_ui/skwasm/skwasm_support.h
+++ b/lib/web_ui/skwasm/skwasm_support.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_LIB_WEB_UI_SKWASM_SKWASM_SUPPORT_H_
+#define FLUTTER_LIB_WEB_UI_SKWASM_SKWASM_SUPPORT_H_
+
 #include <emscripten/threading.h>
 #include <cinttypes>
 #include "third_party/skia/include/core/SkPicture.h"
@@ -36,3 +39,5 @@ extern unsigned int skwasm_createGlTextureFromTextureSource(
     int width,
     int height);
 }
+
+#endif  // FLUTTER_LIB_WEB_UI_SKWASM_SKWASM_SUPPORT_H_
diff --git a/shell/common/vsync_waiters_test.h b/shell/common/vsync_waiters_test.h
index b141077a30e08..fad0bb3494884 100644
--- a/shell/common/vsync_waiters_test.h
+++ b/shell/common/vsync_waiters_test.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#define FML_USED_ON_EMBEDDER
-
 #ifndef FLUTTER_SHELL_COMMON_VSYNC_WAITERS_TEST_H_
 #define FLUTTER_SHELL_COMMON_VSYNC_WAITERS_TEST_H_
 
+#define FML_USED_ON_EMBEDDER
+
 #include <utility>
 
 #include "flutter/shell/common/shell.h"
diff --git a/shell/platform/darwin/common/availability_version_check.h b/shell/platform/darwin/common/availability_version_check.h
index 8724a72d1990a..97b2aab761a86 100644
--- a/shell/platform/darwin/common/availability_version_check.h
+++ b/shell/platform/darwin/common/availability_version_check.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_COMMON_AVAILABILITY_VERSION_CHECK_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_COMMON_AVAILABILITY_VERSION_CHECK_H_
+
 #include <cstdint>
 #include <optional>
 #include <tuple>
@@ -16,3 +19,5 @@ std::optional<ProductVersion> ProductVersionFromSystemVersionPList();
 bool IsEncodedVersionLessThanOrSame(uint32_t encoded_lhs, ProductVersion rhs);
 
 }  // namespace flutter
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_COMMON_AVAILABILITY_VERSION_CHECK_H_
diff --git a/shell/platform/darwin/graphics/FlutterDarwinExternalTextureMetal.h b/shell/platform/darwin/graphics/FlutterDarwinExternalTextureMetal.h
index 25bc6c6d54d79..683d515dfc087 100644
--- a/shell/platform/darwin/graphics/FlutterDarwinExternalTextureMetal.h
+++ b/shell/platform/darwin/graphics/FlutterDarwinExternalTextureMetal.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_GRAPHICS_FLUTTERDARWINEXTERNALTEXTUREMETAL_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_GRAPHICS_FLUTTERDARWINEXTERNALTEXTUREMETAL_H_
+
 #import <Foundation/Foundation.h>
 #import <Metal/Metal.h>
 
@@ -49,3 +52,5 @@
 @property(nonatomic, readonly) int64_t textureID;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_GRAPHICS_FLUTTERDARWINEXTERNALTEXTUREMETAL_H_
diff --git a/shell/platform/darwin/ios/framework/Headers/FlutterEngineGroup.h b/shell/platform/darwin/ios/framework/Headers/FlutterEngineGroup.h
index 097ffd6669fee..fe77b318fe956 100644
--- a/shell/platform/darwin/ios/framework/Headers/FlutterEngineGroup.h
+++ b/shell/platform/darwin/ios/framework/Headers/FlutterEngineGroup.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_HEADERS_FLUTTERENGINEGROUP_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_HEADERS_FLUTTERENGINEGROUP_H_
+
 #import <Foundation/Foundation.h>
 
 #import "FlutterEngine.h"
@@ -108,3 +111,5 @@ FLUTTER_DARWIN_EXPORT
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_HEADERS_FLUTTERENGINEGROUP_H_
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate_Test.h b/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate_Test.h
index d56844a37d5cf..405fb0279ef6e 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate_Test.h
+++ b/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate_Test.h
@@ -2,9 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERAPPDELEGATE_TEST_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERAPPDELEGATE_TEST_H_
+
 @class FlutterViewController;
 
 @interface FlutterAppDelegate (Test)
 @property(nonatomic, copy) FlutterViewController* (^rootFlutterViewControllerGetter)(void);
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERAPPDELEGATE_TEST_H_
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterEngine_Test.h b/shell/platform/darwin/ios/framework/Source/FlutterEngine_Test.h
index 2605d75e83853..238f6528aaf26 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterEngine_Test.h
+++ b/shell/platform/darwin/ios/framework/Source/FlutterEngine_Test.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERENGINE_TEST_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERENGINE_TEST_H_
+
 #import "flutter/shell/common/shell.h"
 #import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterEngine.h"
 #import "flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputDelegate.h"
@@ -41,3 +44,5 @@ class ThreadHost;
 - (void)applicationDidEnterBackground:(NSNotification*)notification;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERENGINE_TEST_H_
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterMetalLayer.h b/shell/platform/darwin/ios/framework/Source/FlutterMetalLayer.h
index 2538aaeac9e2e..f6a1108cb52d4 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterMetalLayer.h
+++ b/shell/platform/darwin/ios/framework/Source/FlutterMetalLayer.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERMETALLAYER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERMETALLAYER_H_
+
 #import <QuartzCore/QuartzCore.h>
 
 /// Drop-in replacement (as far as Flutter is concerned) for CAMetalLayer
@@ -24,3 +27,5 @@
 + (BOOL)enabled;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERMETALLAYER_H_
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate_internal.h b/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate_internal.h
index 00e8696199842..6f80221796fbc 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate_internal.h
+++ b/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate_internal.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERPLUGINAPPLIFECYCLEDELEGATE_INTERNAL_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERPLUGINAPPLIFECYCLEDELEGATE_INTERNAL_H_
+
 @interface FlutterPluginAppLifeCycleDelegate ()
 
 /**
@@ -16,3 +19,5 @@
 
 @end
 ;
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERPLUGINAPPLIFECYCLEDELEGATE_INTERNAL_H_
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterTextureRegistryRelay.h b/shell/platform/darwin/ios/framework/Source/FlutterTextureRegistryRelay.h
index adbcc5986901a..26c19621fce97 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterTextureRegistryRelay.h
+++ b/shell/platform/darwin/ios/framework/Source/FlutterTextureRegistryRelay.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERTEXTUREREGISTRYRELAY_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERTEXTUREREGISTRYRELAY_H_
+
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterTexture.h"
 
@@ -22,3 +25,5 @@ FLUTTER_DARWIN_EXPORT
 @property(nonatomic, assign) NSObject<FlutterTextureRegistry>* parent;
 - (instancetype)initWithParent:(NSObject<FlutterTextureRegistry>*)parent;
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERTEXTUREREGISTRYRELAY_H_
diff --git a/shell/platform/darwin/macos/framework/Headers/FlutterMacOS.h b/shell/platform/darwin/macos/framework/Headers/FlutterMacOS.h
index a7753e578a3fd..f79332512f8b5 100644
--- a/shell/platform/darwin/macos/framework/Headers/FlutterMacOS.h
+++ b/shell/platform/darwin/macos/framework/Headers/FlutterMacOS.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERMACOS_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERMACOS_H_
+
 #import "FlutterAppDelegate.h"
 #import "FlutterAppLifecycleDelegate.h"
 #import "FlutterBinaryMessenger.h"
@@ -14,3 +17,5 @@
 #import "FlutterPluginRegistrarMacOS.h"
 #import "FlutterTexture.h"
 #import "FlutterViewController.h"
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERMACOS_H_
diff --git a/shell/platform/darwin/macos/framework/Headers/FlutterPluginMacOS.h b/shell/platform/darwin/macos/framework/Headers/FlutterPluginMacOS.h
index 653f7052bb77a..8cc14928e1f88 100644
--- a/shell/platform/darwin/macos/framework/Headers/FlutterPluginMacOS.h
+++ b/shell/platform/darwin/macos/framework/Headers/FlutterPluginMacOS.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERPLUGINMACOS_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERPLUGINMACOS_H_
+
 #import <Foundation/Foundation.h>
 
 #import "FlutterAppLifecycleDelegate.h"
@@ -49,3 +52,5 @@ FLUTTER_DARWIN_EXPORT
 NS_ASSUME_NONNULL_END
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERPLUGINMACOS_H_
diff --git a/shell/platform/darwin/macos/framework/Headers/FlutterPluginRegistrarMacOS.h b/shell/platform/darwin/macos/framework/Headers/FlutterPluginRegistrarMacOS.h
index 338896041d6bd..5b990dd84da18 100644
--- a/shell/platform/darwin/macos/framework/Headers/FlutterPluginRegistrarMacOS.h
+++ b/shell/platform/darwin/macos/framework/Headers/FlutterPluginRegistrarMacOS.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERPLUGINREGISTRARMACOS_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERPLUGINREGISTRARMACOS_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "FlutterBinaryMessenger.h"
@@ -144,3 +147,5 @@ FLUTTER_DARWIN_EXPORT
 - (nullable NSObject*)valuePublishedByPlugin:(nonnull NSString*)pluginKey;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERPLUGINREGISTRARMACOS_H_
diff --git a/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h b/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
index 3a28e94a85631..5d8a0d08f45b6 100644
--- a/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
+++ b/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERVIEWCONTROLLER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERVIEWCONTROLLER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "FlutterEngine.h"
@@ -188,3 +191,5 @@ FLUTTER_DARWIN_EXPORT
 @property(readwrite, nonatomic, nullable, copy) NSColor* backgroundColor;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_HEADERS_FLUTTERVIEWCONTROLLER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterBackingStore.h b/shell/platform/darwin/macos/framework/Source/FlutterBackingStore.h
index 809c174c37343..80f8bfe1c75cd 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterBackingStore.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterBackingStore.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERBACKINGSTORE_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERBACKINGSTORE_H_
+
 #import <Cocoa/Cocoa.h>
 #import <Metal/Metal.h>
 
@@ -22,3 +25,5 @@
 - (nonnull instancetype)initWithTexture:(nonnull id<MTLTexture>)texture;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERBACKINGSTORE_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterChannelKeyResponder.h b/shell/platform/darwin/macos/framework/Source/FlutterChannelKeyResponder.h
index 911695e7adaa8..beccb9de78a9b 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterChannelKeyResponder.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterChannelKeyResponder.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERCHANNELKEYRESPONDER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERCHANNELKEYRESPONDER_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterKeyPrimaryResponder.h"
 
 #import <Cocoa/Cocoa.h>
@@ -22,3 +25,5 @@
 - (nonnull instancetype)initWithChannel:(nonnull FlutterBasicMessageChannel*)channel;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERCHANNELKEYRESPONDER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterEmbedderKeyResponder.h b/shell/platform/darwin/macos/framework/Source/FlutterEmbedderKeyResponder.h
index f786bc25bebd0..8600780d675a5 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterEmbedderKeyResponder.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterEmbedderKeyResponder.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTEREMBEDDERKEYRESPONDER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTEREMBEDDERKEYRESPONDER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterKeyPrimaryResponder.h"
@@ -44,3 +47,5 @@ typedef void (^FlutterSendEmbedderKeyEvent)(const FlutterKeyEvent& /* event */,
 - (nonnull NSDictionary*)getPressedState;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTEREMBEDDERKEYRESPONDER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterEngineTestUtils.h b/shell/platform/darwin/macos/framework/Source/FlutterEngineTestUtils.h
index a0a58d4516d82..3e8cb595e8d5e 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterEngineTestUtils.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterEngineTestUtils.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERENGINETESTUTILS_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERENGINETESTUTILS_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterEngine.h"
 
 #import <OCMock/OCMock.h>
@@ -65,3 +68,5 @@ class MockFlutterEngineTest : public AutoreleasePoolTest {
 };
 
 }  // namespace flutter::testing
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERENGINETESTUTILS_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterEngine_Internal.h b/shell/platform/darwin/macos/framework/Source/FlutterEngine_Internal.h
index eaac0d7796539..86d0152011db2 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterEngine_Internal.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterEngine_Internal.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERENGINE_INTERNAL_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERENGINE_INTERNAL_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterEngine.h"
 
 #import <Cocoa/Cocoa.h>
@@ -219,3 +222,5 @@ typedef NS_ENUM(NSInteger, FlutterAppExitResponse) {
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERENGINE_INTERNAL_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterExternalTexture.h b/shell/platform/darwin/macos/framework/Source/FlutterExternalTexture.h
index 79d222a392050..b2aa481aade14 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterExternalTexture.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterExternalTexture.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTEREXTERNALTEXTURE_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTEREXTERNALTEXTURE_H_
+
 #import <Foundation/Foundation.h>
 
 #import "flutter/shell/platform/darwin/graphics/FlutterDarwinContextMetalSkia.h"
@@ -34,3 +37,5 @@
 - (BOOL)populateTexture:(nonnull FlutterMetalExternalTexture*)metalTexture;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTEREXTERNALTEXTURE_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterKeyPrimaryResponder.h b/shell/platform/darwin/macos/framework/Source/FlutterKeyPrimaryResponder.h
index 2c8918d45d70c..5a2e18d3a4ab3 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterKeyPrimaryResponder.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterKeyPrimaryResponder.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYPRIMARYRESPONDER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYPRIMARYRESPONDER_H_
+
 #import <Cocoa/Cocoa.h>
 
 typedef void (^FlutterAsyncKeyCallback)(BOOL handled);
@@ -43,3 +46,5 @@ typedef void (^FlutterAsyncKeyCallback)(BOOL handled);
 @property(nonatomic, nullable, strong) NSMutableDictionary<NSNumber*, NSNumber*>* layoutMap;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYPRIMARYRESPONDER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterKeyboardManager.h b/shell/platform/darwin/macos/framework/Source/FlutterKeyboardManager.h
index ae29439f9ba46..dc96cf72ed86d 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterKeyboardManager.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterKeyboardManager.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYBOARDMANAGER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYBOARDMANAGER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterKeyboardViewDelegate.h"
@@ -66,3 +69,5 @@
 - (nonnull NSDictionary*)getPressedState;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYBOARDMANAGER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterKeyboardViewDelegate.h b/shell/platform/darwin/macos/framework/Source/FlutterKeyboardViewDelegate.h
index f051b95613326..c081e8b1447ab 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterKeyboardViewDelegate.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterKeyboardViewDelegate.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYBOARDVIEWDELEGATE_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYBOARDVIEWDELEGATE_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
@@ -95,3 +98,5 @@ typedef struct {
 - (nonnull NSDictionary*)getPressedState;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERKEYBOARDVIEWDELEGATE_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin.h b/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin.h
index 151754d52a7d3..d4f3df4264ba1 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMENUPLUGIN_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMENUPLUGIN_H_
+
 #import <AppKit/AppKit.h>
 
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
@@ -21,3 +24,5 @@
  */
 + (void)registerWithRegistrar:(nonnull id<FlutterPluginRegistrar>)registrar;
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMENUPLUGIN_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin_Internal.h b/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin_Internal.h
index 415b39398249e..f7dfdd87c9619 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin_Internal.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin_Internal.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMENUPLUGIN_INTERNAL_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMENUPLUGIN_INTERNAL_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterMenuPlugin.h"
 
 /**
@@ -13,3 +16,5 @@
 - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMENUPLUGIN_INTERNAL_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterMouseCursorPlugin.h b/shell/platform/darwin/macos/framework/Source/FlutterMouseCursorPlugin.h
index 73b1d63e87d92..ac986d6fb81c4 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterMouseCursorPlugin.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterMouseCursorPlugin.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMOUSECURSORPLUGIN_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMOUSECURSORPLUGIN_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
@@ -16,3 +19,5 @@
 @interface FlutterMouseCursorPlugin : NSObject <FlutterPlugin>
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMOUSECURSORPLUGIN_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterMutatorView.h b/shell/platform/darwin/macos/framework/Source/FlutterMutatorView.h
index ce7f2e0d4a684..73367ef0fe799 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterMutatorView.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterMutatorView.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMUTATORVIEW_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMUTATORVIEW_H_
+
 #import <Cocoa/Cocoa.h>
 
 #include "flutter/shell/platform/embedder/embedder.h"
@@ -22,3 +25,5 @@
 - (void)applyFlutterLayer:(nonnull const FlutterLayer*)layer;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERMUTATORVIEW_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterPlatformViewController.h b/shell/platform/darwin/macos/framework/Source/FlutterPlatformViewController.h
index 31f9c63cff3fc..4123d8208fccd 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterPlatformViewController.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterPlatformViewController.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERPLATFORMVIEWCONTROLLER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERPLATFORMVIEWCONTROLLER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "FlutterChannels.h"
@@ -56,3 +59,5 @@
 - (void)disposePlatformViews;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERPLATFORMVIEWCONTROLLER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterRenderer.h b/shell/platform/darwin/macos/framework/Source/FlutterRenderer.h
index 46f0048e35fc1..b2f82e3d927a4 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterRenderer.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterRenderer.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERRENDERER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERRENDERER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterEngine.h"
@@ -42,3 +45,5 @@
                          metalTexture:(nonnull FlutterMetalExternalTexture*)metalTexture;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERRENDERER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterSurface.h b/shell/platform/darwin/macos/framework/Source/FlutterSurface.h
index 697bd29dee81c..b566e68092dd3 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterSurface.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterSurface.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERSURFACE_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERSURFACE_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/embedder/embedder.h"
@@ -31,3 +34,5 @@
 @property(readonly, nonatomic) int64_t textureId;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERSURFACE_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterSurfaceManager.h b/shell/platform/darwin/macos/framework/Source/FlutterSurfaceManager.h
index 46872df2ff0fe..45d06f63f5778 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterSurfaceManager.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterSurfaceManager.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERSURFACEMANAGER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERSURFACEMANAGER_H_
+
 #import <Cocoa/Cocoa.h>
 #import <QuartzCore/QuartzCore.h>
 
@@ -103,3 +106,5 @@
 @property(readonly, nonatomic, nonnull) NSArray<CALayer*>* layers;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERSURFACEMANAGER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.h b/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.h
index d5e23c8d5aadc..dbfe75b321114 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTPLUGIN_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTPLUGIN_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
@@ -67,3 +70,5 @@
 @property(nonatomic) NSTextInputContext* textInputContext;
 @property(readwrite, nonatomic) NSString* customRunLoopMode;
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTPLUGIN_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterTextInputSemanticsObject.h b/shell/platform/darwin/macos/framework/Source/FlutterTextInputSemanticsObject.h
index 522722a8e0502..82e0e1ad816b1 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterTextInputSemanticsObject.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterTextInputSemanticsObject.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTSEMANTICSOBJECT_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTSEMANTICSOBJECT_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterPlatformNodeDelegateMac.h"
@@ -99,3 +102,5 @@ class FlutterTextPlatformNode : public ui::AXPlatformNodeBase {
 - (void)startEditing;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTSEMANTICSOBJECT_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterTextureRegistrar.h b/shell/platform/darwin/macos/framework/Source/FlutterTextureRegistrar.h
index cc9ddfdd9c81a..d95aab90e1a1d 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterTextureRegistrar.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterTextureRegistrar.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTUREREGISTRAR_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTUREREGISTRAR_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterEngine.h"
@@ -46,3 +49,5 @@
 - (nullable FlutterExternalTexture*)getTextureWithID:(int64_t)textureID;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTEXTUREREGISTRAR_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterThreadSynchronizer.h b/shell/platform/darwin/macos/framework/Source/FlutterThreadSynchronizer.h
index 8d8d248bdefdb..f4a9915d105a5 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterThreadSynchronizer.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterThreadSynchronizer.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTHREADSYNCHRONIZER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTHREADSYNCHRONIZER_H_
+
 #import <Cocoa/Cocoa.h>
 
 /**
@@ -96,3 +99,5 @@
 - (void)blockUntilFrameAvailable;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERTHREADSYNCHRONIZER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterView.h b/shell/platform/darwin/macos/framework/Source/FlutterView.h
index d82f34c51b0cb..add6131930795 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterView.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterView.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEW_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEW_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterSurfaceManager.h"
@@ -75,3 +78,5 @@ constexpr FlutterViewId kFlutterImplicitViewId = 0ll;
 - (void)setBackgroundColor:(nonnull NSColor*)color;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEW_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterViewControllerTestUtils.h b/shell/platform/darwin/macos/framework/Source/FlutterViewControllerTestUtils.h
index a86002f4db9ca..6cfb45e0969c2 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterViewControllerTestUtils.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterViewControllerTestUtils.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWCONTROLLERTESTUTILS_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWCONTROLLERTESTUTILS_H_
+
 #import <Foundation/NSString.h>
 #import <OCMock/OCMock.h>
 
@@ -15,3 +18,5 @@ namespace flutter::testing {
 id CreateMockViewController();
 
 }  // namespace flutter::testing
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWCONTROLLERTESTUTILS_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterViewController_Internal.h b/shell/platform/darwin/macos/framework/Source/FlutterViewController_Internal.h
index 4ffeffac4bb17..8f9492f30dd51 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterViewController_Internal.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterViewController_Internal.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWCONTROLLER_INTERNAL_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWCONTROLLER_INTERNAL_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h"
 
 #include <memory>
@@ -85,3 +88,5 @@
                                           commandQueue:(nonnull id<MTLCommandQueue>)commandQueue;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWCONTROLLER_INTERNAL_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterViewEngineProvider.h b/shell/platform/darwin/macos/framework/Source/FlutterViewEngineProvider.h
index feafa708be803..d8e0b19aab3f1 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterViewEngineProvider.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterViewEngineProvider.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWENGINEPROVIDER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWENGINEPROVIDER_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterViewProvider.h"
 
 @class FlutterEngine;
@@ -20,3 +23,5 @@
 - (nonnull instancetype)initWithEngine:(nonnull __weak FlutterEngine*)engine;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWENGINEPROVIDER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/FlutterViewProvider.h b/shell/platform/darwin/macos/framework/Source/FlutterViewProvider.h
index 0e78c2bdf0a2d..8261f94cd70c2 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterViewProvider.h
+++ b/shell/platform/darwin/macos/framework/Source/FlutterViewProvider.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWPROVIDER_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWPROVIDER_H_
+
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterView.h"
 
 /**
@@ -21,3 +24,5 @@
 - (nullable FlutterView*)viewForId:(FlutterViewId)id;
 
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_FLUTTERVIEWPROVIDER_H_
diff --git a/shell/platform/darwin/macos/framework/Source/KeyCodeMap_Internal.h b/shell/platform/darwin/macos/framework/Source/KeyCodeMap_Internal.h
index 7d8ee0c54643c..a612d06190655 100644
--- a/shell/platform/darwin/macos/framework/Source/KeyCodeMap_Internal.h
+++ b/shell/platform/darwin/macos/framework/Source/KeyCodeMap_Internal.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_KEYCODEMAP_INTERNAL_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_KEYCODEMAP_INTERNAL_H_
+
 #import <Cocoa/Cocoa.h>
 #include <cinttypes>
 #include <vector>
@@ -107,3 +110,5 @@ typedef struct {
 extern const std::vector<LayoutGoal> kLayoutGoals;
 
 }  // namespace flutter
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_KEYCODEMAP_INTERNAL_H_
diff --git a/shell/platform/darwin/macos/framework/Source/NSView+ClipsToBounds.h b/shell/platform/darwin/macos/framework/Source/NSView+ClipsToBounds.h
index b4669fbde7e3f..49f332247d2e3 100644
--- a/shell/platform/darwin/macos/framework/Source/NSView+ClipsToBounds.h
+++ b/shell/platform/darwin/macos/framework/Source/NSView+ClipsToBounds.h
@@ -2,9 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_NSVIEW_CLIPSTOBOUNDS_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_NSVIEW_CLIPSTOBOUNDS_H_
+
 #import <Cocoa/Cocoa.h>
 
 @interface NSView (ClipsToBounds)
 // This property is available since macOS 10.9 but only declared in macOS 14 SDK.
 @property BOOL clipsToBounds API_AVAILABLE(macos(10.9));
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_NSVIEW_CLIPSTOBOUNDS_H_
diff --git a/shell/platform/darwin/macos/framework/Source/TestFlutterPlatformView.h b/shell/platform/darwin/macos/framework/Source/TestFlutterPlatformView.h
index f6ba2cdfb2e07..3f256ea3af3a0 100644
--- a/shell/platform/darwin/macos/framework/Source/TestFlutterPlatformView.h
+++ b/shell/platform/darwin/macos/framework/Source/TestFlutterPlatformView.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_TESTFLUTTERPLATFORMVIEW_H_
+#define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_TESTFLUTTERPLATFORMVIEW_H_
+
 #import <Foundation/Foundation.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterEngine.h"
@@ -15,3 +18,5 @@
 
 @interface TestFlutterPlatformViewFactory : NSObject <FlutterPlatformViewFactory>
 @end
+
+#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_TESTFLUTTERPLATFORMVIEW_H_
diff --git a/shell/platform/linux/testing/mock_binary_messenger_response_handle.h b/shell/platform/linux/testing/mock_binary_messenger_response_handle.h
index 66372c7109249..42d86cc80fa9c 100644
--- a/shell/platform/linux/testing/mock_binary_messenger_response_handle.h
+++ b/shell/platform/linux/testing/mock_binary_messenger_response_handle.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_BINARY_MESSENGER_RESPONSE_HANDLE_H_
+#define FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_BINARY_MESSENGER_RESPONSE_HANDLE_H_
+
 #include "flutter/shell/platform/linux/fl_binary_messenger_private.h"
 
 G_BEGIN_DECLS
@@ -16,3 +19,5 @@ FlMockBinaryMessengerResponseHandle*
 fl_mock_binary_messenger_response_handle_new();
 
 G_END_DECLS
+
+#endif  // FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_BINARY_MESSENGER_RESPONSE_HANDLE_H_
diff --git a/shell/platform/linux/testing/mock_plugin_registrar.h b/shell/platform/linux/testing/mock_plugin_registrar.h
index dba77d6535c55..6207083c8ef28 100644
--- a/shell/platform/linux/testing/mock_plugin_registrar.h
+++ b/shell/platform/linux/testing/mock_plugin_registrar.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_PLUGIN_REGISTRAR_H_
+#define FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_PLUGIN_REGISTRAR_H_
+
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_binary_messenger.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_plugin_registrar.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_texture_registrar.h"
@@ -19,3 +22,5 @@ FlPluginRegistrar* fl_mock_plugin_registrar_new(
     FlTextureRegistrar* texture_registrar);
 
 G_END_DECLS
+
+#endif  // FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_PLUGIN_REGISTRAR_H_
diff --git a/shell/platform/linux/testing/mock_renderer.h b/shell/platform/linux/testing/mock_renderer.h
index 19268683cf187..5369a37b39b6f 100644
--- a/shell/platform/linux/testing/mock_renderer.h
+++ b/shell/platform/linux/testing/mock_renderer.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_RENDERER_H_
+#define FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_RENDERER_H_
+
 #include "flutter/shell/platform/linux/fl_renderer.h"
 
 G_BEGIN_DECLS
@@ -15,3 +18,5 @@ G_DECLARE_FINAL_TYPE(FlMockRenderer,
 FlMockRenderer* fl_mock_renderer_new();
 
 G_END_DECLS
+
+#endif  // FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_RENDERER_H_
diff --git a/shell/platform/linux/testing/mock_texture_registrar.h b/shell/platform/linux/testing/mock_texture_registrar.h
index 65c617da128be..13d59753bd05f 100644
--- a/shell/platform/linux/testing/mock_texture_registrar.h
+++ b/shell/platform/linux/testing/mock_texture_registrar.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_TEXTURE_REGISTRAR_H_
+#define FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_TEXTURE_REGISTRAR_H_
+
 #include "flutter/shell/platform/linux/fl_texture_registrar_private.h"
 
 G_BEGIN_DECLS
@@ -21,3 +24,5 @@ gboolean fl_mock_texture_registrar_get_frame_available(
     FlMockTextureRegistrar* registrar);
 
 G_END_DECLS
+
+#endif  // FLUTTER_SHELL_PLATFORM_LINUX_TESTING_MOCK_TEXTURE_REGISTRAR_H_
diff --git a/testing/ios/IosUnitTests/App/AppDelegate.h b/testing/ios/IosUnitTests/App/AppDelegate.h
index b9c2cbb009868..c987bb4da9e7a 100644
--- a/testing/ios/IosUnitTests/App/AppDelegate.h
+++ b/testing/ios/IosUnitTests/App/AppDelegate.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_IOS_IOSUNITTESTS_APP_APPDELEGATE_H_
+#define FLUTTER_TESTING_IOS_IOSUNITTESTS_APP_APPDELEGATE_H_
+
 #import <UIKit/UIKit.h>
 
 @interface AppDelegate : UIResponder <UIApplicationDelegate>
@@ -9,3 +12,5 @@
 @property(strong, nonatomic) UIWindow* window;
 
 @end
+
+#endif  // FLUTTER_TESTING_IOS_IOSUNITTESTS_APP_APPDELEGATE_H_
diff --git a/testing/ios/IosUnitTests/App/ViewController.h b/testing/ios/IosUnitTests/App/ViewController.h
index 4f235259bfecc..86d739de890f3 100644
--- a/testing/ios/IosUnitTests/App/ViewController.h
+++ b/testing/ios/IosUnitTests/App/ViewController.h
@@ -2,8 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_IOS_IOSUNITTESTS_APP_VIEWCONTROLLER_H_
+#define FLUTTER_TESTING_IOS_IOSUNITTESTS_APP_VIEWCONTROLLER_H_
+
 #import <UIKit/UIKit.h>
 
 @interface ViewController : UIViewController
 
 @end
+
+#endif  // FLUTTER_TESTING_IOS_IOSUNITTESTS_APP_VIEWCONTROLLER_H_
diff --git a/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/AppDelegate.h b/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/AppDelegate.h
index 99c576ec95059..6c4e04002c709 100644
--- a/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/AppDelegate.h
+++ b/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/AppDelegate.h
@@ -2,8 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_APPDELEGATE_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_APPDELEGATE_H_
+
 #import <UIKit/UIKit.h>
 
 @interface AppDelegate : UIResponder <UIApplicationDelegate>
 
 @end
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_APPDELEGATE_H_
diff --git a/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/SceneDelegate.h b/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/SceneDelegate.h
index 6adc5d3a2cd7f..95dfc1cefe7e2 100644
--- a/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/SceneDelegate.h
+++ b/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/SceneDelegate.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_SCENEDELEGATE_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_SCENEDELEGATE_H_
+
 #import <UIKit/UIKit.h>
 
 @interface SceneDelegate : UIResponder <UIWindowSceneDelegate>
@@ -9,3 +12,5 @@
 @property(strong, nonatomic) UIWindow* window;
 
 @end
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_SCENEDELEGATE_H_
diff --git a/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/ViewController.h b/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/ViewController.h
index 4f235259bfecc..397bc20aa85d5 100644
--- a/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/ViewController.h
+++ b/testing/scenario_app/ios/FlutterAppExtensionTestHost/FlutterAppExtensionTestHost/ViewController.h
@@ -2,8 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_VIEWCONTROLLER_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_VIEWCONTROLLER_H_
+
 #import <UIKit/UIKit.h>
 
 @interface ViewController : UIViewController
 
 @end
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_FLUTTERAPPEXTENSIONTESTHOST_FLUTTERAPPEXTENSIONTESTHOST_VIEWCONTROLLER_H_
diff --git a/testing/scenario_app/ios/Scenarios/Scenarios/AppDelegate.h b/testing/scenario_app/ios/Scenarios/Scenarios/AppDelegate.h
index b7984f089a9c5..46ac1558cc0ba 100644
--- a/testing/scenario_app/ios/Scenarios/Scenarios/AppDelegate.h
+++ b/testing/scenario_app/ios/Scenarios/Scenarios/AppDelegate.h
@@ -2,9 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_APPDELEGATE_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_APPDELEGATE_H_
+
 #import <Flutter/Flutter.h>
 #import <UIKit/UIKit.h>
 
 @interface AppDelegate : FlutterAppDelegate
 
 @end
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_APPDELEGATE_H_
diff --git a/testing/scenario_app/ios/Scenarios/Scenarios/ContinuousTexture.h b/testing/scenario_app/ios/Scenarios/Scenarios/ContinuousTexture.h
index 996de850caa09..4e4422dad3502 100644
--- a/testing/scenario_app/ios/Scenarios/Scenarios/ContinuousTexture.h
+++ b/testing/scenario_app/ios/Scenarios/Scenarios/ContinuousTexture.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_CONTINUOUSTEXTURE_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_CONTINUOUSTEXTURE_H_
+
 #import <Flutter/Flutter.h>
 #import <Foundation/Foundation.h>
 
@@ -18,3 +21,5 @@ NS_ASSUME_NONNULL_BEGIN
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_CONTINUOUSTEXTURE_H_
diff --git a/testing/scenario_app/ios/Scenarios/Scenarios/FlutterEngine+ScenariosTest.h b/testing/scenario_app/ios/Scenarios/Scenarios/FlutterEngine+ScenariosTest.h
index 9438dd3774ea4..1e746199b603b 100644
--- a/testing/scenario_app/ios/Scenarios/Scenarios/FlutterEngine+ScenariosTest.h
+++ b/testing/scenario_app/ios/Scenarios/Scenarios/FlutterEngine+ScenariosTest.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_FLUTTERENGINE_SCENARIOSTEST_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_FLUTTERENGINE_SCENARIOSTEST_H_
+
 #import <Flutter/Flutter.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -14,3 +17,5 @@ NS_ASSUME_NONNULL_BEGIN
                        entrypointArgs:(nullable NSArray<NSString*>*)entrypointArgs;
 @end
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_FLUTTERENGINE_SCENARIOSTEST_H_
diff --git a/testing/scenario_app/ios/Scenarios/Scenarios/ScreenBeforeFlutter.h b/testing/scenario_app/ios/Scenarios/Scenarios/ScreenBeforeFlutter.h
index bcbacd8871dc9..bf184129aae7b 100644
--- a/testing/scenario_app/ios/Scenarios/Scenarios/ScreenBeforeFlutter.h
+++ b/testing/scenario_app/ios/Scenarios/Scenarios/ScreenBeforeFlutter.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_SCREENBEFOREFLUTTER_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_SCREENBEFOREFLUTTER_H_
+
 #import <Flutter/Flutter.h>
 
 @interface ScreenBeforeFlutter : UIViewController
@@ -12,3 +15,5 @@
 @property(nonatomic, readonly) FlutterEngine* engine;
 
 @end
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_SCREENBEFOREFLUTTER_H_
diff --git a/testing/scenario_app/ios/Scenarios/Scenarios/TextPlatformView.h b/testing/scenario_app/ios/Scenarios/Scenarios/TextPlatformView.h
index e88fbe9ee2fd9..c145f93236563 100644
--- a/testing/scenario_app/ios/Scenarios/Scenarios/TextPlatformView.h
+++ b/testing/scenario_app/ios/Scenarios/Scenarios/TextPlatformView.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_TEXTPLATFORMVIEW_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_TEXTPLATFORMVIEW_H_
+
 #import <Flutter/Flutter.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -21,3 +24,5 @@ NS_ASSUME_NONNULL_BEGIN
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOS_TEXTPLATFORMVIEW_H_
diff --git a/testing/scenario_app/ios/Scenarios/ScenariosShare/ShareViewController.h b/testing/scenario_app/ios/Scenarios/ScenariosShare/ShareViewController.h
index 004a75bd6ad35..133213bd1c3dd 100644
--- a/testing/scenario_app/ios/Scenarios/ScenariosShare/ShareViewController.h
+++ b/testing/scenario_app/ios/Scenarios/ScenariosShare/ShareViewController.h
@@ -2,9 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSSHARE_SHAREVIEWCONTROLLER_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSSHARE_SHAREVIEWCONTROLLER_H_
+
 #import <Flutter/Flutter.h>
 #import <UIKit/UIKit.h>
 
 @interface ShareViewController : FlutterViewController
 
 @end
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSSHARE_SHAREVIEWCONTROLLER_H_
diff --git a/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenImage.h b/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenImage.h
index 4c0b9306fe14b..2be1e5c2e3c63 100644
--- a/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenImage.h
+++ b/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenImage.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENIMAGE_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENIMAGE_H_
+
 #import <UIKit/UIKit.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -24,3 +27,5 @@ NS_ASSUME_NONNULL_BEGIN
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENIMAGE_H_
diff --git a/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenPlatformViewTests.h b/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenPlatformViewTests.h
index 625fbf8b31e3c..901d45448dedd 100644
--- a/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenPlatformViewTests.h
+++ b/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenPlatformViewTests.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENPLATFORMVIEWTESTS_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENPLATFORMVIEWTESTS_H_
+
 #import <XCTest/XCTest.h>
 #import "GoldenTestManager.h"
 
@@ -30,3 +33,5 @@ NS_ASSUME_NONNULL_BEGIN
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENPLATFORMVIEWTESTS_H_
diff --git a/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenTestManager.h b/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenTestManager.h
index 7026672af7c46..04a74705c52e1 100644
--- a/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenTestManager.h
+++ b/testing/scenario_app/ios/Scenarios/ScenariosUITests/GoldenTestManager.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENTESTMANAGER_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENTESTMANAGER_H_
+
 #import <Foundation/Foundation.h>
 #import <XCTest/XCTest.h>
 #import "GoldenImage.h"
@@ -33,3 +36,5 @@ const extern double kDefaultRmseThreshold;
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_GOLDENTESTMANAGER_H_
diff --git a/testing/scenario_app/ios/Scenarios/ScenariosUITests/StatusBarTest.h b/testing/scenario_app/ios/Scenarios/ScenariosUITests/StatusBarTest.h
index 03ff9a1c662cd..1312246dab07f 100644
--- a/testing/scenario_app/ios/Scenarios/ScenariosUITests/StatusBarTest.h
+++ b/testing/scenario_app/ios/Scenarios/ScenariosUITests/StatusBarTest.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_STATUSBARTEST_H_
+#define FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_STATUSBARTEST_H_
+
 #import <XCTest/XCTest.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -11,3 +14,5 @@ NS_ASSUME_NONNULL_BEGIN
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_TESTING_SCENARIO_APP_IOS_SCENARIOS_SCENARIOSUITESTS_STATUSBARTEST_H_