[cc] Plumb BeginFrameAcks through SurfaceManager to DisplayScheduler.

cc/surfaces/surface_manager.cc

 // Copyright 2014 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/surfaces/surface_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 100 matching lines @@
   surfaces_to_destroy_.erase(it);
   surface->set_destroyed(false);
   DCHECK_EQ(compositor_frame_sink_support.get(),
             surface->compositor_frame_sink_support().get());
   return surface;
 }
 
 void SurfaceManager::DestroySurface(std::unique_ptr<Surface> surface) {
   DCHECK(thread_checker_.CalledOnValidThread());
   surface->set_destroyed(true);
+  for (auto& observer : observer_list_)
+    observer.OnSurfaceDestroyed(surface->surface_id());
   surfaces_to_destroy_.push_back(std::move(surface));
   GarbageCollectSurfaces();
 }
 
 void SurfaceManager::RequireSequence(const SurfaceId& surface_id,
                                      const SurfaceSequence& sequence) {
   auto* surface = GetSurfaceForId(surface_id);
   if (!surface) {
     DLOG(ERROR) << "Attempting to require callback on nonexistent surface";
     return;
@@ skipping 360 matching lines @@
     dependency_tracker_->OnSurfaceDependenciesChanged(
         surface, added_dependencies, removed_dependencies);
   }
 }
 
 void SurfaceManager::SurfaceDiscarded(Surface* surface) {
   if (dependency_tracker_)
     dependency_tracker_->OnSurfaceDiscarded(surface);
 }
 
+void SurfaceManager::SurfaceReceivedBeginFrame(const SurfaceId& surface_id,
+                                               const BeginFrameArgs& args) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  for (auto& observer : observer_list_)
+    observer.OnSurfaceReceivedBeginFrame(surface_id, args);
+}
+
+void SurfaceManager::SurfaceFinishedBeginFrame(const SurfaceId& surface_id,
+                                               const BeginFrameAck& ack) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  for (auto& observer : observer_list_)
+    observer.OnSurfaceFinishedBeginFrame(surface_id, ack);
+}
+
 void SurfaceManager::UnregisterSurface(const SurfaceId& surface_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
   SurfaceMap::iterator it = surface_map_.find(surface_id);
   DCHECK(it != surface_map_.end());
   surface_map_.erase(it);
   RemoveAllSurfaceReferences(surface_id);
 }
 
 #if DCHECK_IS_ON()
 void SurfaceManager::SurfaceReferencesToStringImpl(const SurfaceId& surface_id,
@@ skipping 32 matching lines @@
     std::vector<SurfaceId> children(iter->second.begin(), iter->second.end());
     std::sort(children.begin(), children.end());
 
     for (const SurfaceId& child_id : children)
       SurfaceReferencesToStringImpl(child_id, indent + "  ", str);
   }
 }
 #endif  // DCHECK_IS_ON()
 
 }  // namespace cc