cc: Consolidate LayerList types.

cc/layers/layer_lists.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_LAYERS_LAYER_LISTS_H_
+#define CC_LAYERS_LAYER_LISTS_H_
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "cc/base/scoped_ptr_vector.h"
+
+namespace cc {
+class Layer;
+class LayerImpl;
+
+typedef std::vector<scoped_refptr<Layer> > LayerList;
+
+typedef ScopedPtrVector<LayerImpl> OwnedLayerImplList;
+typedef std::vector<LayerImpl*> LayerImplList;
+
+}  // namespace cc
+
+#endif  // CC_LAYERS_LAYER_LISTS_H_