[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

cc/surfaces/direct_compositor_frame_sink.cc

Index: cc/surfaces/direct_compositor_frame_sink.cc
diff --git a/cc/surfaces/direct_compositor_frame_sink.cc b/cc/surfaces/direct_compositor_frame_sink.cc
index a915b941c1e6ada8c17fff3cefbfd350d8e76c1a..a3c55c0beb062fa23a1f90bef7ab42768d77aa70 100644
--- a/cc/surfaces/direct_compositor_frame_sink.cc
+++ b/cc/surfaces/direct_compositor_frame_sink.cc
@@ -94,6 +94,10 @@ void DirectCompositorFrameSink::DetachFromClient() {
 }
 
 void DirectCompositorFrameSink::SubmitCompositorFrame(CompositorFrame frame) {
+  DCHECK(frame.metadata.begin_frame_ack.has_damage);
+  DCHECK_LE(BeginFrameArgs::kStartingFrameNumber,
+            frame.metadata.begin_frame_ack.sequence_number);
+
   gfx::Size frame_size = frame.render_pass_list.back()->output_rect.size();
   if (frame_size.IsEmpty() || frame_size != last_swap_frame_size_) {
     delegated_local_surface_id_ = local_surface_id_allocator_.GenerateId();
@@ -151,7 +155,9 @@ void DirectCompositorFrameSink::OnNeedsBeginFrames(bool needs_begin_frame) {
 }
 
 void DirectCompositorFrameSink::OnDidFinishFrame(const BeginFrameAck& ack) {
-  support_->DidFinishFrame(ack);
+  // If there was damage, SubmitCompositorFrame includes the ack.
+  if (!ack.has_damage)
+    support_->BeginFrameDidNotSwap(ack);
 }
 
 }  // namespace cc