Use ContextProvider subclass to provide WGC3D pointers

content/renderer/render_thread_impl.cc

 // 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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 920 matching lines @@
 
   if (!offscreen_compositor_contexts_.get() ||
       offscreen_compositor_contexts_->DestroyedOnMainThread()) {
     offscreen_compositor_contexts_ = ContextProviderCommandBuffer::Create(
         CreateOffscreenContext3d(),
         "Compositor-Offscreen");
   }
   return offscreen_compositor_contexts_;
 }
 
-scoped_refptr<cc::ContextProvider>
+scoped_refptr<webkit::gpu::ContextProviderWebContext>
 RenderThreadImpl::SharedMainThreadContextProvider() {
   DCHECK(IsMainThread());
 #if defined(OS_ANDROID)
   if (SynchronousCompositorFactory* factory =
       SynchronousCompositorFactory::GetInstance())
     return factory->GetOffscreenContextProviderForMainThread();
 #endif
 
   if (!shared_main_thread_contexts_ ||
       shared_main_thread_contexts_->DestroyedOnMainThread()) {
@@ skipping 440 matching lines @@
   hidden_widget_count_--;
 
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     return;
   }
 
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
 }
 
 }  // namespace content