[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

cc/surfaces/direct_compositor_frame_sink_unittest.cc

Index: cc/surfaces/direct_compositor_frame_sink_unittest.cc
diff --git a/cc/surfaces/direct_compositor_frame_sink_unittest.cc b/cc/surfaces/direct_compositor_frame_sink_unittest.cc
index 3bc52f1621a94e17fc062330e0baf5cf091090fe..0439ba917ffebaf4f0283d2f5a24077d233f36c7 100644
--- a/cc/surfaces/direct_compositor_frame_sink_unittest.cc
+++ b/cc/surfaces/direct_compositor_frame_sink_unittest.cc
@@ -109,6 +109,7 @@ class DirectCompositorFrameSinkTest : public testing::Test {
     render_pass->SetNew(1, display_rect_, damage_rect, gfx::Transform());
 
     CompositorFrame frame;
+    frame.metadata.begin_frame_ack = BeginFrameAck(0, 1, 1, 0, true);
     frame.render_pass_list.push_back(std::move(render_pass));
 
     compositor_frame_sink_->SubmitCompositorFrame(std::move(frame));
@@ -194,7 +195,7 @@ class TestBeginFrameObserver : public BeginFrameObserverBase {
  private:
   bool OnBeginFrameDerivedImpl(const BeginFrameArgs& args) override {
     ack_ = BeginFrameAck(args.source_id, args.sequence_number,
-                         args.sequence_number, 0, true);
+                         args.sequence_number, 0, false);
     return true;
   }
 
@@ -204,10 +205,17 @@ class TestBeginFrameObserver : public BeginFrameObserverBase {
   BeginFrameAck ack_;
 };
 
-TEST_F(DirectCompositorFrameSinkTest, AcknowledgesBeginFrames) {
+TEST_F(DirectCompositorFrameSinkTest, AcknowledgesBeginFramesWithDamage) {
+  // Verify that the frame sink acknowledged the BeginFrame attached to
+  // CompositorFrame submitted during SetUp().
+  EXPECT_EQ(BeginFrameAck(0, 1, 1, 0, true), begin_frame_source_->last_ack());
+}
+
+TEST_F(DirectCompositorFrameSinkTest, AcknowledgesBeginFramesWithoutDamage) {
   // Request a BeginFrame from the CompositorFrameSinkClient.
   TestBeginFrameObserver observer(begin_frame_source_.get());
   compositor_frame_sink_client_.begin_frame_source()->AddObserver(&observer);
+  task_runner_->RunUntilIdle();
   observer.FinishFrame();
   compositor_frame_sink_client_.begin_frame_source()->RemoveObserver(&observer);