diff --git a/shell/common/canvas_spy.cc b/shell/common/canvas_spy.cc
index 9ee02ff53dabc..77d9a2f83ad19 100644
--- a/shell/common/canvas_spy.cc
+++ b/shell/common/canvas_spy.cc
@@ -53,6 +53,12 @@ void DidDrawCanvas::willRestore() {}
 
 void DidDrawCanvas::didConcat(const SkMatrix& matrix) {}
 
+void DidDrawCanvas::didConcat44(const SkScalar[]) {}
+
+void DidDrawCanvas::didScale(SkScalar, SkScalar) {}
+
+void DidDrawCanvas::didTranslate(SkScalar, SkScalar) {}
+
 void DidDrawCanvas::didSetMatrix(const SkMatrix& matrix) {}
 
 void DidDrawCanvas::onClipRect(const SkRect& rect,
diff --git a/shell/common/canvas_spy.h b/shell/common/canvas_spy.h
index ef86b9425319d..e9b721e3912be 100644
--- a/shell/common/canvas_spy.h
+++ b/shell/common/canvas_spy.h
@@ -71,6 +71,9 @@ class DidDrawCanvas final : public SkCanvasVirtualEnforcer<SkNoDrawCanvas> {
 
   // |SkCanvasVirtualEnforcer<SkNoDrawCanvas>|
   void didConcat(const SkMatrix&) override;
+  void didConcat44(const SkScalar[]) override;
+  void didScale(SkScalar, SkScalar) override;
+  void didTranslate(SkScalar, SkScalar) override;
 
   // |SkCanvasVirtualEnforcer<SkNoDrawCanvas>|
   void didSetMatrix(const SkMatrix&) override;
diff --git a/testing/mock_canvas.cc b/testing/mock_canvas.cc
index 6782ffdeda733..581abb8591dae 100644
--- a/testing/mock_canvas.cc
+++ b/testing/mock_canvas.cc
@@ -60,6 +60,24 @@ void MockCanvas::didConcat(const SkMatrix& matrix) {
   draw_calls_.emplace_back(DrawCall{current_layer_, ConcatMatrixData{matrix}});
 }
 
+void MockCanvas::didConcat44(const SkScalar matrix[]) {
+  SkMatrix44 m44;
+  m44.setColMajor(matrix);
+  draw_calls_.emplace_back(DrawCall{current_layer_, ConcatMatrix44Data{m44}});
+}
+
+void MockCanvas::didScale(SkScalar x, SkScalar y) {
+  SkMatrix m;
+  m.setScale(x, y);
+  this->didConcat(m);
+}
+
+void MockCanvas::didTranslate(SkScalar x, SkScalar y) {
+  SkMatrix m;
+  m.setTranslate(x, y);
+  this->didConcat(m);
+}
+
 void MockCanvas::didSetMatrix(const SkMatrix& matrix) {
   draw_calls_.emplace_back(DrawCall{current_layer_, SetMatrixData{matrix}});
 }
@@ -346,6 +364,16 @@ std::ostream& operator<<(std::ostream& os,
   return os << data.matrix;
 }
 
+bool operator==(const MockCanvas::ConcatMatrix44Data& a,
+                const MockCanvas::ConcatMatrix44Data& b) {
+  return a.matrix == b.matrix;
+}
+
+std::ostream& operator<<(std::ostream& os,
+                         const MockCanvas::ConcatMatrix44Data& data) {
+  return os << data.matrix;
+}
+
 bool operator==(const MockCanvas::SetMatrixData& a,
                 const MockCanvas::SetMatrixData& b) {
   return a.matrix == b.matrix;
diff --git a/testing/mock_canvas.h b/testing/mock_canvas.h
index cc4c2b11a9c2e..206fa1eefbcc8 100644
--- a/testing/mock_canvas.h
+++ b/testing/mock_canvas.h
@@ -16,6 +16,7 @@
 #include "third_party/skia/include/core/SkClipOp.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
+#include "third_party/skia/include/core/SkMatrix44.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRRect.h"
 #include "third_party/skia/include/core/SkRect.h"
@@ -55,6 +56,10 @@ class MockCanvas : public SkCanvasVirtualEnforcer<SkCanvas> {
     SkMatrix matrix;
   };
 
+  struct ConcatMatrix44Data {
+    SkMatrix44 matrix;
+  };
+
   struct SetMatrixData {
     SkMatrix matrix;
   };
@@ -109,6 +114,7 @@ class MockCanvas : public SkCanvasVirtualEnforcer<SkCanvas> {
                                     SaveLayerData,
                                     RestoreData,
                                     ConcatMatrixData,
+                                    ConcatMatrix44Data,
                                     SetMatrixData,
                                     DrawRectData,
                                     DrawPathData,
@@ -139,6 +145,9 @@ class MockCanvas : public SkCanvasVirtualEnforcer<SkCanvas> {
   void willRestore() override;
   void didRestore() override {}
   void didConcat(const SkMatrix& matrix) override;
+  void didConcat44(const SkScalar matrix[]) override;
+  void didScale(SkScalar x, SkScalar y) override;
+  void didTranslate(SkScalar x, SkScalar y) override;
   void didSetMatrix(const SkMatrix& matrix) override;
 
   // Draw and clip operations that we track.
@@ -269,6 +278,10 @@ extern bool operator==(const MockCanvas::ConcatMatrixData& a,
                        const MockCanvas::ConcatMatrixData& b);
 extern std::ostream& operator<<(std::ostream& os,
                                 const MockCanvas::ConcatMatrixData& data);
+extern bool operator==(const MockCanvas::ConcatMatrix44Data& a,
+                       const MockCanvas::ConcatMatrix44Data& b);
+extern std::ostream& operator<<(std::ostream& os,
+                                const MockCanvas::ConcatMatrix44Data& data);
 extern bool operator==(const MockCanvas::SetMatrixData& a,
                        const MockCanvas::SetMatrixData& b);
 extern std::ostream& operator<<(std::ostream& os,