Merge 116722 - Sync with impl thread when removing references to external textures

Source/WebCore/platform/graphics/chromium/cc/CCLayerTreeHost.h

 /*
  * Copyright (C) 2011 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 144 matching lines @@
     void didLoseContext();
     enum RecreateResult {
         RecreateSucceeded,
         RecreateFailedButTryAgain,
         RecreateFailedAndGaveUp,
     };
     RecreateResult recreateContext();
     void didCommitAndDrawFrame() { m_client->didCommitAndDrawFrame(); }
     void didCompleteSwapBuffers() { m_client->didCompleteSwapBuffers(); }
     void deleteContentsTexturesOnImplThread(TextureAllocator*);
-    void acquireLayerTextures();
+    virtual void acquireLayerTextures();
     // Returns false if we should abort this frame due to initialization failure.
     bool updateLayers(CCTextureUpdater&);
 
     CCLayerTreeHostClient* client() { return m_client; }
 
     int compositorIdentifier() const { return m_compositorIdentifier; }
 
     // Only used when compositing on the main thread.
     void composite();
 
@@ skipping 110 matching lines @@
     Color m_backgroundColor;
 
     TextureList m_deleteTextureAfterCommitList;
     size_t m_partialTextureUpdateRequests;
     static bool s_needsFilterContext;
 };
 
 }
 
 #endif