[blink] Request compositing update when canvas hibernates/wakes up.

third_party/WebKit/Source/platform/graphics/ImageBuffer.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  * 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 163 matching lines @@
   void UpdateGPUMemoryUsage() const;
   static intptr_t GetGlobalGPUMemoryUsage() { return global_gpu_memory_usage_; }
   static unsigned GetGlobalAcceleratedImageBufferCount() {
     return global_accelerated_image_buffer_count_;
   }
   intptr_t GetGPUMemoryUsage() { return gpu_memory_usage_; }
 
   void DisableAcceleration();
   void SetSurface(std::unique_ptr<ImageBufferSurface>);
 
+  void SetNeedsCompositingUpdate();
+
   WeakPtrFactory<ImageBuffer> weak_ptr_factory_;
 
  protected:
   ImageBuffer(std::unique_ptr<ImageBufferSurface>);
 
  private:
   enum SnapshotState {
     kInitialSnapshotState,
     kDidAcquireSnapshot,
     kDrawnToAfterSnapshot,
@@ skipping 24 matching lines @@
   int Height() const { return size_.Height(); }
   int Width() const { return size_.Width(); }
 
   const unsigned char* data_;
   const IntSize size_;
 };
 
 }  // namespace blink
 
 #endif  // ImageBuffer_h