Revert "Delete CC."

cc/resources/return_callback.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_RESOURCES_RETURN_CALLBACK_H_
+#define CC_RESOURCES_RETURN_CALLBACK_H_
+
+#include "base/callback.h"
+#include "cc/resources/returned_resource.h"
+
+namespace cc {
+class BlockingTaskRunner;
+
+typedef base::Callback<void(const ReturnedResourceArray&,
+                            BlockingTaskRunner* main_thread_task_runner)>
+    ReturnCallback;
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RETURN_CALLBACK_H_