Fix lifecycle-vs-threads of GpuVDAContext3D.

content/renderer/render_thread_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 200 matching lines @@
   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
 
   // Causes the idle handler to skip sending idle notifications
   // on the two next scheduled calls, so idle notifications are
   // not sent for at least one notification delay.
   void PostponeIdleNotification();
 
   // Returns a graphics context shared among all
   // RendererGpuVideoDecoderFactories, or NULL on error.  Context remains owned
   // by this class and must be null-tested before each use to detect context
-  // loss.  The returned WeakPtr<> is only valid on the compositor thread when
+  // loss.  The returned context is only valid on the compositor thread when
   // threaded compositing is enabled.
-  base::WeakPtr<WebGraphicsContext3DCommandBufferImpl> GetGpuVDAContext3D();
+  WebGraphicsContext3DCommandBufferImpl* GetGpuVDAContext3D();
+
+  // Handle loss of the shared GpuVDAContext3D context above.
+  static void OnGpuVDAContextLoss();
 
   // AudioRendererMixerManager instance which manages renderer side mixer
   // instances shared based on configured audio parameters.  Lazily created on
   // first call.
   content::AudioRendererMixerManager* GetAudioRendererMixerManager();
 
  private:
   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   void Init();
@@ skipping 66 matching lines @@
   ObserverList<content::RenderProcessObserver> observers_;
 
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> gpu_vda_context3d_;
 
   scoped_ptr<content::AudioRendererMixerManager> audio_renderer_mixer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_