Revert "Delete CC."

cc/surfaces/surface_id_allocator.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_ID_ALLOCATOR_H_
+#define CC_SURFACES_SURFACE_ID_ALLOCATOR_H_
+
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surfaces_export.h"
+
+namespace cc {
+
+// This is a helper class for generating surface IDs within a specified
+// namespace.  This is not threadsafe, to use from multiple threads wrap this
+// class in a mutex.
+class CC_SURFACES_EXPORT SurfaceIdAllocator {
+ public:
+  explicit SurfaceIdAllocator(uint32_t id_namespace);
+
+  SurfaceId GenerateId();
+
+  static uint32_t NamespaceForId(SurfaceId id);
+
+  uint32_t id_namespace() const { return id_namespace_; }
+
+ private:
+  const uint32_t id_namespace_;
+  uint32_t next_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceIdAllocator);
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_SURFACE_ID_ALLOCATOR_H_