Split the media context from the compositor worker context.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 0dbe07a5ab1491331dd0a837a121e35dec5ecf63..59cc700d6bcce4fb148d09a255a204fc2a3e1dd0 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -750,7 +750,7 @@ std::unique_ptr<cc::OutputSurface> RenderWidget::CreateOutputSurface(
   }
 
   scoped_refptr<ContextProviderCommandBuffer> worker_context_provider =
-      RenderThreadImpl::current()->SharedWorkerContextProvider();
+      RenderThreadImpl::current()->SharedCompositorWorkerContextProvider();
   if (!worker_context_provider) {
     // Cause the compositor to wait and try again.
     return nullptr;