[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 480 matching lines @@
     dependency_tracker_->OnSurfaceDependenciesChanged(
         surface, added_dependencies, removed_dependencies);
   }
 }
 
 void SurfaceManager::SurfaceDiscarded(Surface* surface) {
   if (dependency_tracker_)
     dependency_tracker_->OnSurfaceDiscarded(surface);
 }
 
+void SurfaceManager::SurfaceProducerStateChanged(Surface* surface,
+                                                 Surface::ProducerState state) {
+  CHECK(thread_checker_.CalledOnValidThread());
+  for (auto& observer : observer_list_)
+    observer.OnSurfaceProducerStateChanged(surface->surface_id());
+}
+
 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