Add layer name into frame viewer

cc/layers/layer_client.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_CLIENT_H_
+#define CC_LAYERS_LAYER_CLIENT_H_
+
+#include <string>
+
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+class CC_EXPORT LayerClient {
+ public:
+  virtual std::string DebugName() = 0;
+
+ protected:
+  virtual ~LayerClient() {}
+};
+
+}  // namespace cc
+
+#endif  // CC_LAYERS_LAYER_CLIENT_H_