[cc] Plumb BeginFrameAcks through SurfaceManager to DisplayScheduler.

cc/test/test_begin_frame_ack_tracker.cc

Index: cc/test/test_begin_frame_ack_tracker.cc
diff --git a/cc/test/test_begin_frame_ack_tracker.cc b/cc/test/test_begin_frame_ack_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..459e94e3ab1e22a6b53eece7b6451d006ab38eab
--- /dev/null
+++ b/cc/test/test_begin_frame_ack_tracker.cc
@@ -0,0 +1,15 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/test/test_begin_frame_ack_tracker.h"
+
+namespace cc {
+
+void TestBeginFrameAckTracker::OnSurfaceDamaged(const SurfaceId& surface,
+                                                const BeginFrameAck& ack,
+                                                bool* changed) {
+  last_ack_ = ack;
+}
+
+}  // namespace cc