cc: Introduce BeginFrame sequence numbers and acknowledgements.

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index a6a88a2410942938e63fe8194132f171b1855694..99f878d5997887c50477d523a6fcec54b5222bad 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -200,7 +200,7 @@ void InProcessContextFactory::CreateCompositorFrameSink(
           base::MakeUnique<cc::DelayBasedTimeSource>(
               compositor->task_runner().get())));
   std::unique_ptr<cc::DisplayScheduler> scheduler(new cc::DisplayScheduler(
-      begin_frame_source.get(), compositor->task_runner().get(),
+      compositor->task_runner().get(),
       display_output_surface->capabilities().max_frames_pending));
 
   data->display = base::MakeUnique<cc::Display>(