Establish mojo service between Canvas (blink) and SurfaceManager (browser)

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 183 matching lines @@
 
     void notifyListenersCanvasChanged();
 
     // For Canvas HitRegions
     bool isSupportedInteractiveCanvasFallback(const Element&);
     std::pair<Element*, String> getControlAndIdIfHitRegionExists(const LayoutPoint&);
     String getIdFromControl(const Element*);
 
     // For OffscreenCanvas that controls this html canvas element
     CanvasSurfaceLayerBridge* surfaceLayerBridge() const { return m_surfaceLayerBridge.get(); }
-    void createSurfaceLayerBridge();
+    bool createSurfaceLayer();
 
     void detachContext() { m_context = nullptr; }
 
 protected:
     void didMoveToNewDocument(Document& oldDocument) override;
 
 private:
     explicit HTMLCanvasElement(Document&);
     void dispose();
 
@@ skipping 41 matching lines @@
 
     mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
 
     // Used for OffscreenCanvas that controls this HTML canvas element
     OwnPtr<CanvasSurfaceLayerBridge> m_surfaceLayerBridge;
 };
 
 } // namespace blink
 
 #endif // HTMLCanvasElement_h