Android Webview IPC-based sync compositing

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 f7eef237bb9de39a121d580f439bb364ddb97845..068348776c98b8ca5a126652b6d4b7ab29e14bee 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -115,6 +115,10 @@ class VideoCaptureImplManager;
 class WebGraphicsContext3DCommandBufferImpl;
 class WebRTCIdentityService;
 
+#if defined(OS_ANDROID)
+class SynchronousCompositorFilter;
+#endif
+
 #if defined(COMPILER_MSVC)
 // See explanation for other RenderViewHostImpl which is the same issue.
 #pragma warning(push)
@@ -280,6 +284,10 @@ class CONTENT_EXPORT RenderThreadImpl
   RendererDemuxerAndroid* renderer_demuxer() {
     return renderer_demuxer_.get();
   }
+
+  SynchronousCompositorFilter* sync_compositor_message_filter() {
+    return sync_compositor_message_filter_.get();
+  }
 #endif
 
   // Creates the embedder implementation of WebMediaStreamCenter.
@@ -602,6 +610,10 @@ class CONTENT_EXPORT RenderThreadImpl
   scoped_ptr<InputHandlerManager> input_handler_manager_;
   scoped_refptr<CompositorForwardingMessageFilter> compositor_message_filter_;
 
+#if defined(OS_ANDROID)
+  scoped_refptr<SynchronousCompositorFilter> sync_compositor_message_filter_;
+#endif
+
   scoped_refptr<BluetoothMessageFilter> bluetooth_message_filter_;
 
   scoped_refptr<cc_blink::ContextProviderWebContext>