Provide shared context to Platform API in renderer.

content/common/gpu/client/context_provider_command_buffer.h

 // Copyright (c) 2013 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_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER
 #define CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER
 
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "cc/context_provider.h"
@@ skipping 11 matching lines @@
 // WebGraphicsContext3DCommandBufferImpl context and a GrContext.
 class ContextProviderCommandBuffer : public cc::ContextProvider {
  public:
   ContextProviderCommandBuffer();
 
   virtual bool InitializeOnMainThread() OVERRIDE;
   virtual bool BindToCurrentThread() OVERRIDE;
   virtual WebGraphicsContext3DCommandBufferImpl* Context3d() OVERRIDE;
   virtual class GrContext* GrContext() OVERRIDE;
   virtual void VerifyContexts() OVERRIDE;
-
-  bool DestroyedOnMainThread();
+  virtual bool DestroyedOnMainThread() OVERRIDE;
 
  protected:
   virtual ~ContextProviderCommandBuffer();
 
   // Subclass must provide an implementation to create an offscreen context.
   virtual scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
       CreateOffscreenContext3d() = 0;
 
   virtual void OnLostContext();
   virtual void OnMemoryAllocationChanged(bool nonzero_allocation);
 
  private:
 
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d_;
   scoped_ptr<webkit::gpu::GrContextForWebGraphicsContext3D> gr_context_;
 
   base::Lock destroyed_lock_;
   bool destroyed_;
 
   class LostContextCallbackProxy;
   scoped_ptr<LostContextCallbackProxy> lost_context_callback_proxy_;
 
   class MemoryAllocationCallbackProxy;
   scoped_ptr<MemoryAllocationCallbackProxy> memory_allocation_callback_proxy_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER