cc: Make separate interface for BeginFrame ipc from OutputSurface

content/browser/android/in_process/synchronous_compositor_factory_impl.cc

Index: content/browser/android/in_process/synchronous_compositor_factory_impl.cc
diff --git a/content/browser/android/in_process/synchronous_compositor_factory_impl.cc b/content/browser/android/in_process/synchronous_compositor_factory_impl.cc
index 2bde4a45856ae2f3c9c3e3ce5294374a0561145d..4f392bfb9f0692cca3ebf03c1c065342ce155e5a 100644
--- a/content/browser/android/in_process/synchronous_compositor_factory_impl.cc
+++ b/content/browser/android/in_process/synchronous_compositor_factory_impl.cc
@@ -5,6 +5,8 @@
 #include "content/browser/android/in_process/synchronous_compositor_factory_impl.h"
 
 #include "base/observer_list.h"
+#include "content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h"
+#include "content/browser/android/in_process/synchronous_compositor_impl.h"
 #include "content/browser/android/in_process/synchronous_compositor_output_surface.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/renderer/gpu/frame_swap_message_queue.h"
@@ -193,6 +195,13 @@ SynchronousCompositorFactoryImpl::GetInputHandlerManagerClient() {
   return synchronous_input_event_filter();
 }
 
+scoped_ptr<cc::BeginFrameSource>
+SynchronousCompositorFactoryImpl::CreateExternalBeginFrameSource(
+    int routing_id) {
+  return make_scoped_ptr(
+             new SynchronousCompositorExternalBeginFrameSource(routing_id));
+}
+
 scoped_refptr<ContextProviderWebContext>
 SynchronousCompositorFactoryImpl::CreateOffscreenContextProvider(
     const blink::WebGraphicsContext3D::Attributes& attributes,