cc: Introduce BeginFrame sequence numbers and acknowledgements.

android_webview/browser/surfaces_instance.cc

Index: android_webview/browser/surfaces_instance.cc
diff --git a/android_webview/browser/surfaces_instance.cc b/android_webview/browser/surfaces_instance.cc
index f16fe5e0c29b7bc491eca366ff9ec3e2cecc1445..46ff27ad4a859705c638e6500f808d1825d50bdd 100644
--- a/android_webview/browser/surfaces_instance.cc
+++ b/android_webview/browser/surfaces_instance.cc
@@ -65,8 +65,7 @@ SurfacesInstance::SurfacesInstance()
           DeferredGpuCommandService::GetInstance())));
   output_surface_ = output_surface_holder.get();
   std::unique_ptr<cc::DisplayScheduler> scheduler(new cc::DisplayScheduler(
-      begin_frame_source.get(), nullptr,
-      output_surface_holder->capabilities().max_frames_pending));
+      nullptr, output_surface_holder->capabilities().max_frames_pending));
   display_.reset(new cc::Display(
       nullptr /* shared_bitmap_manager */,
       nullptr /* gpu_memory_buffer_manager */, settings, frame_sink_id_,