[cc] Remove BeginFrameAck from BFS::DidFinishFrame and update tests.

cc/surfaces/surface_synchronization_unittest.cc

 // 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 "base/containers/flat_set.h"
 #include "cc/surfaces/compositor_frame_sink_support.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/surfaces/surface_observer.h"
 #include "cc/test/begin_frame_args_test.h"
@@ skipping 961 matching lines @@
   ui::LatencyInfo::LatencyComponent comp1;
   EXPECT_TRUE(
       aggregated_latency_info.FindLatency(latency_type1, latency_id1, &comp1));
   EXPECT_EQ(latency_sequence_number1, comp1.sequence_number);
   EXPECT_TRUE(
       aggregated_latency_info.FindLatency(latency_type2, latency_id2, nullptr));
   EXPECT_TRUE(aggregated_latency_info.FindLatency(
       ui::DISPLAY_COMPOSITOR_RECEIVED_FRAME_COMPONENT, nullptr));
 }
 
-TEST_F(SurfaceSynchronizationTest, PassesOnBeginFrameAcks) {
-  const SurfaceId display_id = MakeSurfaceId(kDisplayFrameSink, 1);
-
-  // Request BeginFrames.
-  display_support().SetNeedsBeginFrame(true);
-
-  // Issue a BeginFrame.
-  BeginFrameArgs args =
-      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, 0, 1);
-  begin_frame_source()->TestOnBeginFrame(args);
-
-  // Check that the support forwards a DidNotProduceFrame ack to the
-  // BeginFrameSource.
-  BeginFrameAck ack(0, 1, 1, false);
-  display_support().DidNotProduceFrame(ack);
-  EXPECT_EQ(ack, begin_frame_source()->LastAckForObserver(&display_support()));
-
-  // Issue another BeginFrame.
-  args = CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, 0, 2);
-  begin_frame_source()->TestOnBeginFrame(args);
-
-  // Check that the support forwards the BeginFrameAck attached
-  // to a CompositorFrame to the BeginFrameSource.
-  BeginFrameAck ack2(0, 2, 2, true);
-  CompositorFrame frame = MakeCompositorFrame();
-  frame.metadata.begin_frame_ack = ack2;
-  display_support().SubmitCompositorFrame(display_id.local_surface_id(),
-                                          std::move(frame));
-  EXPECT_EQ(ack2, begin_frame_source()->LastAckForObserver(&display_support()));
-}
+// TODO(eseckler): Add back tests for BeginFrameAck forwarding through
+// CompositorFrameSinkSupport when we add plumbing of BeginFrameAcks through
+// SurfaceObservers.
 
 // Checks that resources and ack are sent together if possible.
 TEST_F(SurfaceSynchronizationTest, ReturnResourcesWithAck) {
   const SurfaceId parent_id = MakeSurfaceId(kParentFrameSink, 1);
   TransferableResource resource;
   resource.id = 1234;
   parent_support().SubmitCompositorFrame(
       parent_id.local_surface_id(),
       MakeCompositorFrame(empty_surface_ids(), empty_surface_ids(),
                           {resource}));
@@ skipping 363 matching lines @@
               DidReceiveCompositorFrameAck(Eq(returned_resources2)));
   child_support1().SubmitCompositorFrame(
       child_id1.local_surface_id(),
       MakeCompositorFrame(empty_surface_ids(), empty_surface_ids(),
                           {resource2}));
   testing::Mock::VerifyAndClearExpectations(&support_client_);
 }
 
 }  // namespace test
 }  // namespace cc