cc: Rationalize sync points and lost status for returned resources

cc/layers/delegated_frame_resource_collection.h

 // Copyright 2013 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_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_
 #define CC_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 36 matching lines @@
   friend class base::RefCounted<DelegatedFrameResourceCollection>;
   ~DelegatedFrameResourceCollection();
 
   DelegatedFrameResourceCollectionClient* client_;
   scoped_refptr<BlockingTaskRunner> main_thread_runner_;
 
   ReturnedResourceArray returned_resources_for_child_compositor_;
   bool lost_all_resources_;
 
   struct RefCount {
+    RefCount()
+        : refs_to_return(0), refs_to_wait_for(0), sync_point(0), lost(false) {}
     int refs_to_return;
     int refs_to_wait_for;
+    unsigned int sync_point;
+    bool lost;
   };
   typedef base::hash_map<unsigned, RefCount> ResourceIdRefCountMap;
   ResourceIdRefCountMap resource_id_ref_count_map_;
 
   base::ThreadChecker main_thread_checker_;
   base::WeakPtrFactory<DelegatedFrameResourceCollection> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameResourceCollection);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_