Add layer name into frame viewer

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 035e071a5fd19a69849d8a097125c4a3817c193f..69b14b480e7252a1b0a9330307fe112aec7002a8 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -47,6 +47,13 @@ class ResourceUpdateQueue;
 class ScrollbarLayer;
 struct AnimationEvent;
 
+class CC_EXPORT LayerClient {
+  public:
+    virtual std::string DebugName() = 0;
+  protected:
+    virtual ~LayerClient() {}
+};
+
 // Base class for composited layers. Special layer types are derived from
 // this class.
 class CC_EXPORT Layer : public base::RefCounted<Layer>,
@@ -293,6 +300,10 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   virtual void ReduceMemoryUsage() {}
 
   void SetDebugName(const std::string& debug_name);
+  virtual std::string DebugName();
+
+  void SetLayerClient(LayerClient* client) { client_ = client; }
+
   void SetCompositingReasons(CompositingReasons reasons);
 
   virtual void PushPropertiesTo(LayerImpl* layer);
@@ -514,6 +525,8 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   // Transient properties.
   float raster_scale_;
 
+  LayerClient* client_;
+
   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 
   base::Closure did_scroll_callback_;