pepper: Use the RenderThread's shared context as the parent context.

content/renderer/pepper/pepper_platform_context_3d_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_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
 #ifdef ENABLE_GPU
 
 class CommandBufferProxy;
 namespace gpu {
 class CommandBuffer;
 }  // namespace gpu
 
 namespace content {
+class ContextProviderCommandBuffer;
 class GpuChannelHost;
 
-class PepperParentContextProvider;
-
 class PlatformContext3DImpl
     : public webkit::ppapi::PluginDelegate::PlatformContext3D {
  public:
-  explicit PlatformContext3DImpl(
-      PepperParentContextProvider* parent_context_provider);
+  explicit PlatformContext3DImpl();
   virtual ~PlatformContext3DImpl();
 
   virtual bool Init(const int32* attrib_list,
                     PlatformContext3D* share_context) OVERRIDE;
   virtual unsigned GetBackingTextureId() OVERRIDE;
   virtual WebKit::WebGraphicsContext3D* GetParentContext() OVERRIDE;
   virtual bool IsOpaque() OVERRIDE;
   virtual gpu::CommandBuffer* GetCommandBuffer() OVERRIDE;
   virtual int GetCommandBufferRouteId() OVERRIDE;
   virtual void SetContextLostCallback(const base::Closure& callback) OVERRIDE;
   virtual void SetOnConsoleMessageCallback(
       const ConsoleMessageCallback& callback) OVERRIDE;
   virtual bool Echo(const base::Closure& task) OVERRIDE;
 
-  virtual void SetParentContext(
-      PepperParentContextProvider* parent_context_provider);
+  bool SetParentAndCreateBackingTextureIfNeeded();
+  void DestroyParentContextProviderAndBackingTexture();
 
  private:
   bool InitRaw();
   void OnContextLost();
   void OnConsoleMessage(const std::string& msg, int id);
 
-  // Implicitly weak pointer; must outlive this instance.
-  PepperParentContextProvider* parent_context_provider_;
-  base::WeakPtr<WebGraphicsContext3DCommandBufferImpl> parent_context_;
+  scoped_refptr<ContextProviderCommandBuffer> parent_context_provider_;
   scoped_refptr<GpuChannelHost> channel_;
   unsigned int parent_texture_id_;
   bool has_alpha_;
   CommandBufferProxyImpl* command_buffer_;
   base::Closure context_lost_callback_;
   ConsoleMessageCallback console_message_callback_;
   base::WeakPtrFactory<PlatformContext3DImpl> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // ENABLE_GPU
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_IMPL_H_