cc: Add frame data to LTHI tracing

cc/debug/traced_value.cc

Index: cc/debug/traced_value.cc
diff --git a/cc/debug/traced_value.cc b/cc/debug/traced_value.cc
index 637c700552571c2ffe0e63dfe630e0d77cd84283..a2633cbcfbe23b776e4c9e5d0ce98cbb5ceb8d6d 100644
--- a/cc/debug/traced_value.cc
+++ b/cc/debug/traced_value.cc
@@ -16,9 +16,12 @@ scoped_ptr<base::Value> TracedValue::CreateIDRef(const void* id) {
   return res.PassAs<base::Value>();
 }
 
-void TracedValue::MakeDictIntoImplicitSnapshot(
-    base::DictionaryValue* dict, const char* object_name, const void* id) {
+void TracedValue::MakeDictIntoImplicitSnapshot(const char* category,
+                                               base::DictionaryValue* dict,
+                                               const char* object_name,
+                                               const void* id) {
   dict->SetString("id", base::StringPrintf("%s/%p", object_name, id));
+  dict->SetString("cat", category);
 }
 
 scoped_ptr<base::debug::ConvertableToTraceFormat> TracedValue::FromValue(