Revert "Delete CC."

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::ReceiveFromChild(
+    const TransferableResourceArray& resources) {
+  for (TransferableResourceArray::const_iterator it = resources.begin();
+       it != resources.end();
+       ++it) {
+    ResourceRefs& ref = resource_id_use_count_map_[it->id];
+    ref.refs_holding_resource_alive++;
+    ref.refs_received_from_child++;
+  }
+}
+
+void SurfaceResourceHolder::RefResources(
+    const TransferableResourceArray& resources) {
+  for (TransferableResourceArray::const_iterator it = resources.begin();
+       it != resources.end();
+       ++it) {
+    ResourceIdCountMap::iterator count_it =
+        resource_id_use_count_map_.find(it->id);
+    DCHECK(count_it != resource_id_use_count_map_.end());
+    count_it->second.refs_holding_resource_alive++;
+  }
+}
+
+void SurfaceResourceHolder::UnrefResources(
+    const ReturnedResourceArray& resources) {
+  ReturnedResourceArray resources_available_to_return;
+
+  for (ReturnedResourceArray::const_iterator it = resources.begin();
+       it != resources.end();
+       ++it) {
+    ResourceProvider::ResourceId id = it->id;
+    ResourceIdCountMap::iterator count_it = resource_id_use_count_map_.find(id);
+    if (count_it == resource_id_use_count_map_.end())
+      continue;
+    ResourceRefs& ref = count_it->second;
+    ref.refs_holding_resource_alive -= it->count;
+    if (ref.refs_holding_resource_alive == 0) {
+      ReturnedResource returned = *it;
+      returned.count = ref.refs_received_from_child;
+      resources_available_to_return.push_back(returned);
+      resource_id_use_count_map_.erase(count_it);
+    }
+  }
+
+  client_->ReturnResources(resources_available_to_return);
+}
+
+}  // namespace cc