[Android WebView] Implement Ubercomp for Render Thread support

content/browser/android/in_process/synchronous_compositor_factory_impl.cc

 // Copyright 2014 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/browser/android/in_process/synchronous_compositor_factory_impl.h"
 
 #include "content/browser/android/in_process/synchronous_compositor_output_surface.h"
 #include "content/public/browser/browser_thread.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "ui/gl/android/surface_texture.h"
@@ skipping 161 matching lines @@
 
   if (failed) {
     offscreen_context_for_main_thread_ = NULL;
   }
   return offscreen_context_for_main_thread_;
 }
 
 scoped_refptr<cc::ContextProvider> SynchronousCompositorFactoryImpl::
     CreateOnscreenContextProviderForCompositorThread(
         scoped_refptr<gfx::GLSurface> surface) {
-  DCHECK(surface);
   DCHECK(service_);
 
   if (!share_context_.get())
     share_context_ = CreateContext(NULL, service_, NULL);
   return webkit::gpu::ContextProviderInProcess::Create(
       WrapContext(CreateContext(surface, service_, share_context_.get())),
-      "Compositor-Onscreen");
+      "Child-Compositor");
+}
+
+gpu::GLInProcessContext* SynchronousCompositorFactoryImpl::GetShareContext() {
+  DCHECK(share_context_.get());
+  return share_context_.get();
 }
 
 scoped_refptr<StreamTextureFactory>
 SynchronousCompositorFactoryImpl::CreateStreamTextureFactory(int view_id) {
   scoped_refptr<StreamTextureFactorySynchronousImpl> factory(
       StreamTextureFactorySynchronousImpl::Create(
           base::Bind(
               &SynchronousCompositorFactoryImpl::TryCreateStreamTextureFactory,
               base::Unretained(this)),
           view_id));
@@ skipping 40 matching lines @@
   return video_context_provider_;
 }
 
 void SynchronousCompositorFactoryImpl::SetDeferredGpuService(
     scoped_refptr<gpu::InProcessCommandBuffer::Service> service) {
   DCHECK(!service_);
   service_ = service;
 }
 
 }  // namespace content