[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

cc/output/begin_frame_args.cc

Index: cc/output/begin_frame_args.cc
diff --git a/cc/output/begin_frame_args.cc b/cc/output/begin_frame_args.cc
index f6d66520b5150a5abf26372bc006447a45b29fc9..bf41afa277dafb8600b530df9f9ee7f084db09dd 100644
--- a/cc/output/begin_frame_args.cc
+++ b/cc/output/begin_frame_args.cc
@@ -127,4 +127,11 @@ BeginFrameAck::BeginFrameAck(uint32_t source_id,
   DCHECK_LT(BeginFrameArgs::kInvalidFrameNumber, sequence_number);
 }
 
+// static
+BeginFrameAck BeginFrameAck::CreateManualAckWithDamage() {
+  return BeginFrameAck(BeginFrameArgs::kManualSourceId,
+                       BeginFrameArgs::kStartingFrameNumber,
+                       BeginFrameArgs::kInvalidFrameNumber, 0, true);
+}
+
 }  // namespace cc