Debugging code to print layer tree

ui/gfx/compositor/layer.h

Index: ui/gfx/compositor/layer.h
diff --git a/ui/gfx/compositor/layer.h b/ui/gfx/compositor/layer.h
index cde70e9f8054fb76f3fcd3c8610e5f99b2de0216..930e0af918f16e9294216b59347d8edbebde35a4 100644
--- a/ui/gfx/compositor/layer.h
+++ b/ui/gfx/compositor/layer.h
@@ -6,6 +6,7 @@
 #define UI_GFX_COMPOSITOR_LAYER_H_
 #pragma once
 
+#include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ -152,6 +153,9 @@ class COMPOSITOR_EXPORT Layer :
 
   const gfx::Rect& hole_rect() const {  return hole_rect_; }
 
+  const std::string& name() const { return name_; }
+  void set_name(const std::string& name) { name_ = name; }
+
   // The compositor.
   const Compositor* compositor() const { return compositor_; }
   Compositor* compositor() { return compositor_; }
@@ -302,6 +306,8 @@ class COMPOSITOR_EXPORT Layer :
 
   float opacity_;
 
+  std::string name_;
+
   LayerDelegate* delegate_;
 
   scoped_ptr<LayerAnimator> animator_;