Revamp OffscreenCanvas commit flow

third_party/WebKit/Source/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 55 matching lines @@
 class ImageBuffer;
 class ImageBufferSurface;
 class ImageData;
 class IntSize;
 
 class
     CanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContextOrImageBitmapRenderingContext;
 typedef CanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContextOrImageBitmapRenderingContext
     RenderingContext;
 
-class CORE_EXPORT HTMLCanvasElement final : public HTMLElement,
-                                            public ContextLifecycleObserver,
-                                            public PageVisibilityObserver,
-                                            public CanvasImageSource,
-                                            public ImageBufferClient,
-                                            public ImageBitmapSource,
-                                            public OffscreenCanvasPlaceholder {
+class CORE_EXPORT HTMLCanvasElement final
+    : public HTMLElement,
+      public ContextLifecycleObserver,
+      public PageVisibilityObserver,
+      public CanvasImageSource,
+      public CanvasSurfaceLayerBridgeObserver,
+      public ImageBufferClient,
+      public ImageBitmapSource,
+      public OffscreenCanvasPlaceholder {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(HTMLCanvasElement);
   USING_PRE_FINALIZER(HTMLCanvasElement, dispose);
 
  public:
   using Node::getExecutionContext;
 
   DECLARE_NODE_FACTORY(HTMLCanvasElement);
   ~HTMLCanvasElement() override;
 
@@ skipping 87 matching lines @@
                                             SnapshotReason,
                                             const FloatSize&) const override;
   bool wouldTaintOrigin(SecurityOrigin*) const override;
   FloatSize elementSize(const FloatSize&) const override;
   bool isCanvasElement() const override { return true; }
   bool isOpaque() const override;
   bool isAccelerated() const override;
   int sourceWidth() override { return m_size.width(); }
   int sourceHeight() override { return m_size.height(); }
 
+  // CanvasSurfaceLayerBridgeObserver implementation
+  void OnWebLayerReplaced() override;
+
   // ImageBufferClient implementation
   void notifySurfaceInvalid() override;
   bool isDirty() override { return !m_dirtyRect.isEmpty(); }
   void didDisableAcceleration() override;
   void didFinalizeFrame() override;
   void restoreCanvasMatrixClipStack(SkCanvas*) const override;
 
   void doDeferredPaintInvalidation();
 
   // ImageBitmapSource implementation
@@ skipping 22 matching lines @@
 
   // For Canvas HitRegions
   bool isSupportedInteractiveCanvasFallback(const Element&);
   HitTestCanvasResult* getControlAndIdIfHitRegionExists(const LayoutPoint&);
   String getIdFromControl(const Element*);
 
   // For OffscreenCanvas that controls this html canvas element
   CanvasSurfaceLayerBridge* surfaceLayerBridge() const {
     return m_surfaceLayerBridge.get();
   }
-  bool createSurfaceLayer();
+  void createLayer();
 
   void detachContext() { m_context = nullptr; }
 
  protected:
   void didMoveToNewDocument(Document& oldDocument) override;
 
  private:
   explicit HTMLCanvasElement(Document&);
   void dispose();
 
@@ skipping 63 matching lines @@
   // Used for OffscreenCanvas that controls this HTML canvas element
   std::unique_ptr<CanvasSurfaceLayerBridge> m_surfaceLayerBridge;
 
   int m_numFramesSinceLastRenderingModeSwitch;
   bool m_pendingRenderingModeSwitch;
 };
 
 }  // namespace blink
 
 #endif  // HTMLCanvasElement_h