Compositor thread plumbing for layout rectangle debug info.

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 6d06b6d2e70d5e7d8e658941168b5b9a19933fba..e9825106a385187b438f4f0a7f3c068668a47ef4 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -35,6 +35,10 @@
 #include "ui/gfx/transform.h"
 
 namespace base {
+namespace debug {
+class ConvertableToTraceFormat;
+}
+
 class DictionaryValue;
 }
 
@@ -494,6 +498,9 @@ class CC_EXPORT LayerImpl : LayerAnimationValueObserver {
 
   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 
+  virtual void SetDebugInfo(
+      scoped_refptr<base::debug::ConvertableToTraceFormat> other);
+
  protected:
   LayerImpl(LayerTreeImpl* layer_impl, int id);
 
@@ -632,6 +639,8 @@ class CC_EXPORT LayerImpl : LayerAnimationValueObserver {
   // hierarchy before layers can be drawn.
   DrawProperties<LayerImpl> draw_properties_;
 
+  scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };