sync compositor: Implement post metadata to UI

content/browser/android/synchronous_compositor_host.h

Index: content/browser/android/synchronous_compositor_host.h
diff --git a/content/browser/android/synchronous_compositor_host.h b/content/browser/android/synchronous_compositor_host.h
index 5ba20d9929c78aa74c7fd19526489a77e3ef60b3..93bfb8e87124eb0698e9e7aa8baa39e8884e34b5 100644
--- a/content/browser/android/synchronous_compositor_host.h
+++ b/content/browser/android/synchronous_compositor_host.h
@@ -78,6 +78,7 @@ class SynchronousCompositorHost : public SynchronousCompositor {
 
   // Called by SynchronousCompositorBrowserFilter.
   int routing_id() const { return routing_id_; }
+  void UpdateFrameMetaData(cc::CompositorFrameMetadata frame_metadata);
   void ProcessCommonParams(const SyncCompositorCommonRendererParams& params);
 
   SynchronousCompositorClient* client() { return client_; }
@@ -91,14 +92,10 @@ class SynchronousCompositorHost : public SynchronousCompositor {
   SynchronousCompositorHost(RenderWidgetHostViewAndroid* rwhva,
                             SynchronousCompositorClient* client,
                             bool use_in_proc_software_draw);
-  void UpdateFrameMetaData(cc::CompositorFrameMetadata frame_metadata);
   void CompositorFrameSinkCreated();
   bool DemandDrawSwInProc(SkCanvas* canvas);
   void SetSoftwareDrawSharedMemoryIfNeeded(size_t stride, size_t buffer_size);
   void SendZeroMemory();
-  SynchronousCompositor::Frame ProcessHardwareFrame(
-      uint32_t compositor_frame_sink_id,
-      cc::CompositorFrame compositor_frame);
   SynchronousCompositorBrowserFilter* GetFilter();
 
   RenderWidgetHostViewAndroid* const rwhva_;
@@ -109,6 +106,8 @@ class SynchronousCompositorHost : public SynchronousCompositor {
   IPC::Sender* const sender_;
   const bool use_in_process_zero_copy_software_draw_;
 
+  bool registered_with_filter_ = false;

[sgurun-gerrit only, 2016/10/27 23:14:48]

I don't know if such initialization is acceptable or not as a style. Please
confirm.

[boliu, 2016/10/28 00:41:38]

See "Non-Static Class Member Initializers" as officially being allowed here:
https://chromium-cpp.appspot.com/

Here's an example:
https://cs.chromium.org/chromium/src/cc/output/gl_renderer.h?rcl=0&l=541

+
   size_t bytes_limit_;
   std::unique_ptr<SharedMemoryWithSize> software_draw_shm_;