[Impeller] Use new SkParagraph APIs for stroked text. (#41735)

~~Requires https://skia-review.googlesource.com/c/skia/+/692196~~ Landed

Fixes flutter/flutter#126010

Looks correct on iOS, renders incorrectly on Android � . Might be related to all of our text bounds looking off.

### iOS

![flutter_03](https://github.com/flutter/engine/assets/8975114/50897fd0-47fd-4cad-b158-1662aa650092)

### Android

![flutter_04](https://github.com/flutter/engine/assets/8975114/bcefe843-71a0-4b98-956f-039918e9a4cc)

Author: Jonah Williams

impeller/display_list/BUILD.gn

@@ -15,6 +15,7 @@ impeller_component("skia_conversions") {
     "../geometry",
     "//flutter/fml",
     "//third_party/skia",
+    "//third_party/skia/modules/skparagraph",
   ]
 }
 

impeller/display_list/dl_dispatcher.cc

@@ -1104,9 +1104,23 @@ void DlDispatcher::drawDisplayList(
 void DlDispatcher::drawTextBlob(const sk_sp<SkTextBlob> blob,
                                 SkScalar x,
                                 SkScalar y) {
-  canvas_.DrawTextFrame(TextFrameFromTextBlob(blob),  //
-                        impeller::Point{x, y},        //
-                        paint_                        //
+  const auto text_frame = TextFrameFromTextBlob(blob);
+  if (paint_.style == Paint::Style::kStroke) {
+    auto path = skia_conversions::PathDataFromTextBlob(blob);
+    auto bounds = text_frame.GetBounds();
+    if (!bounds.has_value()) {
+      return;
+    }
+    canvas_.Save();
+    canvas_.Translate({x + bounds->origin.x, y + bounds->origin.y, 0.0});
+    canvas_.DrawPath(path, paint_);
+    canvas_.Restore();
+    return;
+  }
+
+  canvas_.DrawTextFrame(text_frame,             //
+                        impeller::Point{x, y},  //
+                        paint_                  //
   );
 }
 

impeller/display_list/dl_unittests.cc

@@ -447,6 +447,19 @@ TEST_P(DisplayListTest, CanDrawWithMaskBlur) {
   ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
 }
 
+TEST_P(DisplayListTest, CanDrawStrokedText) {
+  flutter::DisplayListBuilder builder;
+  flutter::DlPaint paint;
+
+  paint.setDrawStyle(flutter::DlDrawStyle::kStroke);
+  paint.setColor(flutter::DlColor::kRed());
+  builder.DrawTextBlob(
+      SkTextBlob::MakeFromString("stoked about stroked text", CreateTestFont()),
+      250, 250, paint);
+
+  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
+}
+
 TEST_P(DisplayListTest, IgnoreMaskFilterWhenSavingLayer) {
   auto texture = CreateTextureForFixture("embarcadero.jpg");
   flutter::DisplayListBuilder builder;

impeller/display_list/skia_conversions.cc

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "impeller/display_list/skia_conversions.h"
+#include "third_party/skia/modules/skparagraph/include/Paragraph.h"
 
 namespace impeller {
 namespace skia_conversions {
@@ -159,6 +160,14 @@ std::vector<Matrix> ToRSXForms(const SkRSXform xform[], int count) {
   return result;
 }
 
+Path PathDataFromTextBlob(const sk_sp<SkTextBlob>& blob) {
+  if (!blob) {
+    return {};
+  }
+
+  return ToPath(skia::textlayout::Paragraph::GetPath(blob.get()));
+}
+
 std::optional<impeller::PixelFormat> ToPixelFormat(SkColorType type) {
   switch (type) {
     case kRGBA_8888_SkColorType:

impeller/display_list/skia_conversions.h

@@ -16,6 +16,7 @@
 #include "third_party/skia/include/core/SkPoint.h"
 #include "third_party/skia/include/core/SkRRect.h"
 #include "third_party/skia/include/core/SkRSXform.h"
+#include "third_party/skia/include/core/SkTextBlob.h"
 
 namespace impeller {
 namespace skia_conversions {
@@ -40,6 +41,8 @@ Path ToPath(const SkPath& path);
 
 Path ToPath(const SkRRect& rrect);
 
+Path PathDataFromTextBlob(const sk_sp<SkTextBlob>& blob);
+
 std::optional<impeller::PixelFormat> ToPixelFormat(SkColorType type);
 
 }  // namespace skia_conversions