Optimize overlays in CanvasKit

ci/licenses_golden/licenses_flutter

@@ -37120,7 +37120,6 @@ ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/canvaskit_canvas.da
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/color_filter.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/display_canvas_factory.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/embedded_views.dart + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/embedded_views_diff.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/fonts.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/image.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/image_filter.dart + ../../../flutter/LICENSE
@@ -37134,6 +37133,7 @@ ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/multi_surface_raste
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/n_way_canvas.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/offscreen_canvas_rasterizer.dart + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/overlay_scene_optimizer.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/painting.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/path.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/path_metrics.dart + ../../../flutter/LICENSE
@@ -39976,7 +39976,6 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/canvaskit_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/color_filter.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/display_canvas_factory.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/embedded_views.dart
-FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/embedded_views_diff.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/fonts.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/image.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/image_filter.dart
@@ -39990,6 +39989,7 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/multi_surface_rasteri
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/n_way_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/offscreen_canvas_rasterizer.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/overlay_scene_optimizer.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/painting.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/path.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/path_metrics.dart

lib/web_ui/lib/src/engine.dart

@@ -25,7 +25,6 @@ export 'engine/canvaskit/canvaskit_canvas.dart';
 export 'engine/canvaskit/color_filter.dart';
 export 'engine/canvaskit/display_canvas_factory.dart';
 export 'engine/canvaskit/embedded_views.dart';
-export 'engine/canvaskit/embedded_views_diff.dart';
 export 'engine/canvaskit/fonts.dart';
 export 'engine/canvaskit/image.dart';
 export 'engine/canvaskit/image_filter.dart';
@@ -39,6 +38,7 @@ export 'engine/canvaskit/multi_surface_rasterizer.dart';
 export 'engine/canvaskit/n_way_canvas.dart';
 export 'engine/canvaskit/native_memory.dart';
 export 'engine/canvaskit/offscreen_canvas_rasterizer.dart';
+export 'engine/canvaskit/overlay_scene_optimizer.dart';
 export 'engine/canvaskit/painting.dart';
 export 'engine/canvaskit/path.dart';
 export 'engine/canvaskit/path_metrics.dart';