Merge 92520 - [chromium] Accelerated canvas breaks when moving canvases or resources between Pages

Source/WebCore/platform/graphics/chromium/WebGLLayerChromium.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
 
     virtual void setLayerRenderer(LayerRendererChromium*);
 
 protected:
     virtual const char* layerTypeAsString() const { return "WebGLLayer"; }
 
 private:
     explicit WebGLLayerChromium(GraphicsLayerChromium* owner);
     friend class WebGLLayerChromiumRateLimitTask;
 
+    virtual unsigned textureId() const { return m_textureId; }
     void rateLimitContext(Timer<WebGLLayerChromium>*);
 
     // GraphicsContext3D::platformLayer has a side-effect of assigning itself
     // to the layer. Because of that GraphicsContext3D's destructor will reset
     // layer's context to 0.
     GraphicsContext3D* m_context;
+    unsigned m_textureId;
+    bool m_textureChanged;
     bool m_contextSupportsRateLimitingExtension;
     Timer<WebGLLayerChromium> m_rateLimitingTimer;
     bool m_textureUpdated;
 };
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)
 
 #endif