Add SurfaceFactory::Reset

cc/surfaces/surface_resource_holder.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_RESOURCE_HOLDER_H_
 #define CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_
 
 #include <unordered_map>
 
 #include "base/macros.h"
 #include "cc/base/resource_id.h"
 #include "cc/resources/returned_resource.h"
 #include "cc/resources/transferable_resource.h"
 #include "cc/surfaces/surfaces_export.h"
 
 namespace cc {
 class SurfaceFactoryClient;
 
 // A SurfaceResourceHolder manages the lifetime of resources submitted by a
 // particular SurfaceFactory. Each resource is held by the service until
 // it is no longer referenced by any pending frames or by any
 // resource providers.
 class CC_SURFACES_EXPORT SurfaceResourceHolder {
  public:
   explicit SurfaceResourceHolder(SurfaceFactoryClient* client);
   ~SurfaceResourceHolder();
 
+  void Reset();
   void ReceiveFromChild(const TransferableResourceArray& resources);
   void RefResources(const TransferableResourceArray& resources);
   void UnrefResources(const ReturnedResourceArray& resources);
 
  private:
   SurfaceFactoryClient* client_;
 
   struct ResourceRefs {
     ResourceRefs();
 
     int refs_received_from_child;
     int refs_holding_resource_alive;
     gpu::SyncToken sync_token;
   };
   // Keeps track of the number of users currently in flight for each resource
   // ID we've received from the client. When this counter hits zero for a
   // particular resource, that ID is available to return to the client with
   // the most recently given non-empty sync token.
   using ResourceIdInfoMap = std::unordered_map<ResourceId, ResourceRefs>;
   ResourceIdInfoMap resource_id_info_map_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceResourceHolder);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_