Simplify rate limiting since it's main thread shared context only

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 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.
 
 #include "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #if defined(OS_ANDROID)
@@ skipping 630 matching lines @@
 void RenderWidgetCompositor::ScheduleComposite() {
   if (!suppress_schedule_composite_)
     widget_->scheduleComposite();
 }
 
 scoped_refptr<cc::ContextProvider>
 RenderWidgetCompositor::OffscreenContextProvider() {
   return RenderThreadImpl::current()->OffscreenCompositorContextProvider();
 }
 
+void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
+  cc::ContextProvider* provider =
+      RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
+  provider->Context3d()->rateLimitOffscreenContextCHROMIUM();
+}
+
 }  // namespace content