Add layer name into frame viewer

cc/layers/content_layer.h

Index: cc/layers/content_layer.h
diff --git a/cc/layers/content_layer.h b/cc/layers/content_layer.h
index db574bcc5c8af4683385bd53f38d9fe32c919429..54120b93ea29892aaad99ccf60a0d8b81f8b1daf 100644
--- a/cc/layers/content_layer.h
+++ b/cc/layers/content_layer.h
@@ -5,6 +5,8 @@
 #ifndef CC_LAYERS_CONTENT_LAYER_H_
 #define CC_LAYERS_CONTENT_LAYER_H_
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/tiled_layer.h"
@@ -52,6 +54,8 @@ class CC_EXPORT ContentLayer : public TiledLayer {
 
   virtual bool SupportsLCDText() const OVERRIDE;
 
+  virtual std::string DebugName() OVERRIDE;
+
  protected:
   explicit ContentLayer(ContentLayerClient* client);
   virtual ~ContentLayer();