Split the media context from the compositor worker context.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 015cc7daf60c404064c99ed6e7773740d3192fd9..5cc1093f88948ecf39a0f1340e2887c0fd933bfb 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -340,8 +340,10 @@ class CONTENT_EXPORT RenderThreadImpl
   // A TaskRunner instance that runs tasks on the raster worker pool.
   base::TaskRunner* GetWorkerTaskRunner();
 
-  // Returns a shared worker context provider that can be used on any thread.
-  scoped_refptr<ContextProviderCommandBuffer> SharedWorkerContextProvider();
+  // Returns a worker context provider that will be bound on the compositor
+  // thread.
+  scoped_refptr<ContextProviderCommandBuffer>
+  SharedCompositorWorkerContextProvider();
 
   // Causes the idle handler to skip sending idle notifications
   // on the two next scheduled calls, so idle notifications are