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 1969b74967806b7c210a5d0553f2e1da4d1fa7e6..27760f97ce03e9c3800275190a7a6128e47d6ca2 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;
 }
 
@@ -505,6 +509,9 @@ 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);
 
@@ -645,6 +652,8 @@ 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);
 };