Revert "Delete CC."

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 "base/containers/hash_tables.h"
+#include "base/macros.h"
+#include "cc/resources/resource_provider.h"
+#include "cc/resources/returned_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 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;
+  };
+  // 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.
+  typedef base::hash_map<ResourceProvider::ResourceId, ResourceRefs>
+      ResourceIdCountMap;
+  ResourceIdCountMap resource_id_use_count_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceResourceHolder);
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_