[cc] Plumb BeginFrameAcks through SurfaceManager to DisplayScheduler.

cc/surfaces/surface_synchronization_unittest.cc

Index: cc/surfaces/surface_synchronization_unittest.cc
diff --git a/cc/surfaces/surface_synchronization_unittest.cc b/cc/surfaces/surface_synchronization_unittest.cc
index 5846fb9476ab68950f8e4806e2f92dcac7cd28d2..9d70a8bcb12a6938c9798fe0ed11f3c6d794285f 100644
--- a/cc/surfaces/surface_synchronization_unittest.cc
+++ b/cc/surfaces/surface_synchronization_unittest.cc
@@ -152,10 +152,16 @@ class SurfaceSynchronizationTest : public testing::Test,
 
   // SurfaceObserver implementation:
   void OnSurfaceCreated(const SurfaceInfo& surface_info) override {}
-  void OnSurfaceDamaged(const SurfaceId& surface_id, bool* changed) override {
-    damaged_surfaces_.insert(surface_id);
+  void OnSurfaceDamaged(const SurfaceId& surface_id,
+                        const BeginFrameAck& ack,
+                        bool* changed) override {
+    if (ack.has_damage)
+      damaged_surfaces_.insert(surface_id);
   }
   void OnSurfaceDiscarded(const SurfaceId& surface_id) override {}
+  void OnSurfaceDestroyed(const SurfaceId& surface_id) override {}
+  void OnSurfaceDamageExpected(const SurfaceId& surface_id,
+                               const BeginFrameArgs& args) override {}
 
  protected:
   testing::NiceMock<MockCompositorFrameSinkSupportClient> support_client_;
@@ -976,10 +982,6 @@ TEST_F(SurfaceSynchronizationTest,
       ui::DISPLAY_COMPOSITOR_RECEIVED_FRAME_COMPONENT, nullptr));
 }
 
-// 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);