Add layer name into frame viewer

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index dd150e38598fbe6c739644929154ebf8d83d8e13..107f9b5cc2b531e66fd9051e6a556228cbc9ab8c 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -6,6 +6,7 @@
 
 #include <algorithm>
 
+#include "base/debug/trace_event.h"
 #include "base/location.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
@@ -843,6 +844,12 @@ void Layer::SavePaintProperties() {
 
 bool Layer::Update(ResourceUpdateQueue* queue,
                    const OcclusionTracker* occlusion) {
+  bool is_tracing;

[enne (OOO), 2013/08/01 22:12:59]

Could you do this during Layer::PushPropertiesTo instead of Layer::Update? Not
every layer gets updated.  This would also remove the need to make sure that
every derived layer called Layer::Update.

[qiankun, 2013/08/02 17:50:26]

Done.

+  TRACE_EVENT_CATEGORY_GROUP_ENABLED("cc", &is_tracing);
+  if (is_tracing)
+      SetDebugName(DebugName());
+  else
+      SetDebugName(std::string());
   return false;
 }
 
@@ -855,6 +862,12 @@ void Layer::SetDebugName(const std::string& debug_name) {
   SetNeedsCommit();
 }
 
+std::string Layer::DebugName() {
+  if (!client_)
+    return std::string();
+  return client_->DebugName();
+}
+
 void Layer::SetCompositingReasons(CompositingReasons reasons) {
   compositing_reasons_ = reasons;
 }