Use ContextProvider subclass to provide WGC3D pointers

content/renderer/android/synchronous_compositor_factory.h

 // Copyright 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_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_FACTORY_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_FACTORY_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace cc {
 class ContextProvider;
 class OutputSurface;
 }
 
 namespace content {
 
+class ContextProviderWebContext;
 class InputHandlerManagerClient;
 class StreamTextureFactory;
 
 // Decouples creation from usage of the parts needed for the synchonous
 // compositor rendering path. In practice this is only used in single
 // process mode (namely, for Android WebView) hence the implementation of
 // this will be injected from the logical 'browser' side code.
 class SynchronousCompositorFactory {
  public:
   // Must only be called once, e.g. on startup. Ownership of |instance| remains
   // with the caller.
   static void SetInstance(SynchronousCompositorFactory* instance);
   static SynchronousCompositorFactory* GetInstance();
 
   virtual scoped_refptr<base::MessageLoopProxy>
       GetCompositorMessageLoop() = 0;
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(
       int routing_id) = 0;
 
   // The factory maintains ownership of the returned interface.
   virtual InputHandlerManagerClient* GetInputHandlerManagerClient() = 0;
 
-  virtual scoped_refptr<cc::ContextProvider>
+  virtual scoped_refptr<ContextProviderWebContext>
       GetOffscreenContextProviderForMainThread() = 0;
   virtual scoped_refptr<cc::ContextProvider>
       GetOffscreenContextProviderForCompositorThread() = 0;
   virtual scoped_ptr<StreamTextureFactory> CreateStreamTextureFactory(
       int view_id) = 0;
 
  protected:
   SynchronousCompositorFactory() {}
   virtual ~SynchronousCompositorFactory() {}
 };
 
 }
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_FACTORY_H_