Hook up ui::Compositor to Display's BeginFrameSource

cc/surfaces/onscreen_display_client.cc

Index: cc/surfaces/onscreen_display_client.cc
diff --git a/cc/surfaces/onscreen_display_client.cc b/cc/surfaces/onscreen_display_client.cc
index 50b64a78fc5d6fb2e2e7f2c04cf9b7a1142f8a72..8184fc53c54d4cce39ad0bc1a6b74537eff0c983 100644
--- a/cc/surfaces/onscreen_display_client.cc
+++ b/cc/surfaces/onscreen_display_client.cc
@@ -62,8 +62,7 @@ void OnscreenDisplayClient::CommitVSyncParameters(base::TimeTicks timebase,
     interval = BeginFrameArgs::DefaultInterval();
   }
 
-  surface_display_output_surface_->ReceivedVSyncParameters(timebase, interval);
-  if (synthetic_frame_source_.get())
+  if (synthetic_frame_source_)
     synthetic_frame_source_->OnUpdateVSyncParameters(timebase, interval);
 }
 
@@ -76,4 +75,11 @@ void OnscreenDisplayClient::SetMemoryPolicy(const ManagedMemoryPolicy& policy) {
   surface_display_output_surface_->SetMemoryPolicy(policy);
 }
 
+BeginFrameSource* OnscreenDisplayClient::BeginFrameSourceForChildren() {
+  if (unthrottled_frame_source_)
+    return unthrottled_frame_source_.get();
+  DCHECK(synthetic_frame_source_);
+  return synthetic_frame_source_.get();
+}
+
 }  // namespace cc