Compositor thread plumbing for layout rectangle debug info.

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 77907193b59a9c2ddd23ce2f3cf1c54c0b381acd..e804883e87be14f84cb6ebf027ff502634458616 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -873,10 +873,12 @@ void Layer::PushPropertiesTo(LayerImpl* layer) {
   bool is_tracing;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
                                      &is_tracing);
-  if (is_tracing)
-      layer->SetDebugName(DebugName());
-  else
-      layer->SetDebugName(std::string());
+  if (is_tracing) {
+    layer->SetDebugName(DebugName());
+    layer->SetDebugInfo(TakeDebugInfo());
+  } else {
+    layer->SetDebugName(std::string());
+  }
 
   layer->SetCompositingReasons(compositing_reasons_);
   layer->SetDoubleSided(double_sided_);
@@ -1034,6 +1036,14 @@ std::string Layer::DebugName() {
   return client_ ? client_->DebugName() : std::string();
 }
 
+scoped_refptr<base::debug::ConvertableToTraceFormat> Layer::TakeDebugInfo() {
+  if (client_)
+    return client_->TakeDebugInfo();
+  else
+    return NULL;
+}
+
+
 void Layer::SetCompositingReasons(CompositingReasons reasons) {
   compositing_reasons_ = reasons;
 }