Add layer name into frame viewer

cc/layers/heads_up_display_layer.h

Index: cc/layers/heads_up_display_layer.h
diff --git a/cc/layers/heads_up_display_layer.h b/cc/layers/heads_up_display_layer.h
index 7038cd480c3b80d850933063352a786f6a6007cf..f13d56bba67c544bf49ead8e154ff1d26a364f6c 100644
--- a/cc/layers/heads_up_display_layer.h
+++ b/cc/layers/heads_up_display_layer.h
@@ -5,6 +5,8 @@
 #ifndef CC_LAYERS_HEADS_UP_DISPLAY_LAYER_H_
 #define CC_LAYERS_HEADS_UP_DISPLAY_LAYER_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/contents_scaling_layer.h"
@@ -23,6 +25,8 @@ class CC_EXPORT HeadsUpDisplayLayer : public ContentsScalingLayer {
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
 
+  virtual std::string DebugName() OVERRIDE;
+
  protected:
   HeadsUpDisplayLayer();