Allow layers to signal that additional sequences are needed before surface destruction

cc/surfaces/surface_manager.h

 // 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.
 
 #ifndef CC_SURFACES_SURFACE_MANAGER_H_
 #define CC_SURFACES_SURFACE_MANAGER_H_
 
 #include <list>
 #include <set>
 #include <vector>
@@ skipping 28 matching lines @@
   void AddObserver(SurfaceDamageObserver* obs) {
     observer_list_.AddObserver(obs);
   }
 
   void RemoveObserver(SurfaceDamageObserver* obs) {
     observer_list_.RemoveObserver(obs);
   }
 
   void SurfaceModified(SurfaceId surface_id);
 
-  // A frame for a surface satisfies a set of sequence numbers.
-  void DidSatisfySequences(SurfaceId id, std::vector<uint32_t>* sequence);
+  // A frame for a surface satisfies a set of sequence numbers in a particular
+  // id namespace.
+  void DidSatisfySequences(uint32_t id_namespace,
+                           std::vector<uint32_t>* sequence);
 
  private:
   void SearchForSatisfaction();
 
   typedef base::hash_map<SurfaceId, Surface*> SurfaceMap;
   SurfaceMap surface_map_;
   ObserverList<SurfaceDamageObserver> observer_list_;
   base::ThreadChecker thread_checker_;
 
   // List of surfaces to be destroyed, along with what sequences they're still
   // waiting on.
   typedef std::list<std::pair<Surface*, std::set<SurfaceSequence>>>
       SurfaceDestroyList;
   SurfaceDestroyList surfaces_to_destroy_;
 
   // Set of SurfaceSequences that have been satisfied by a frame but not yet
   // waited on.
   std::set<SurfaceSequence> satisfied_sequences_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_MANAGER_H_