Add SurfaceFactory::Reset

cc/surfaces/surface_resource_holder.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_resource_holder.h"
 
 #include "cc/surfaces/surface_factory_client.h"
 
 namespace cc {
 
 SurfaceResourceHolder::SurfaceResourceHolder(SurfaceFactoryClient* client)
     : client_(client) {
 }
 
 SurfaceResourceHolder::~SurfaceResourceHolder() {
 }
 
 SurfaceResourceHolder::ResourceRefs::ResourceRefs()
     : refs_received_from_child(0), refs_holding_resource_alive(0) {
 }
 
+void SurfaceResourceHolder::Reset() {
+  resource_id_info_map_.clear();
+}
+
 void SurfaceResourceHolder::ReceiveFromChild(
     const TransferableResourceArray& resources) {
   for (TransferableResourceArray::const_iterator it = resources.begin();
        it != resources.end();
        ++it) {
     ResourceRefs& ref = resource_id_info_map_[it->id];
     ref.refs_holding_resource_alive++;
     ref.refs_received_from_child++;
   }
 }
@@ skipping 32 matching lines @@
       returned.count = ref.refs_received_from_child;
       resources_available_to_return.push_back(returned);
       resource_id_info_map_.erase(count_it);
     }
   }
 
   client_->ReturnResources(resources_available_to_return);
 }
 
 }  // namespace cc