Implement frame attribution (FrameBlamer)

base/trace_event/trace_event.h

Index: base/trace_event/trace_event.h
diff --git a/base/trace_event/trace_event.h b/base/trace_event/trace_event.h
index ed49fe4656f9326b232f973e69936ad3f31f4af9..c2dc5d71887ea75d8d46cce72005086746b9846d 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -971,7 +971,8 @@ template<typename IDType> class TraceScopedTrackableObject {
     TRACE_EVENT_OBJECT_CREATED_WITH_ID(category_group_, name_, id_);
   }
 
-  template <typename ArgType> void snapshot(ArgType snapshot) {
+  template <typename ArgType>
+  void Snapshot(ArgType snapshot) const {
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(category_group_, name_, id_, snapshot);
   }
 
@@ -987,6 +988,8 @@ template<typename IDType> class TraceScopedTrackableObject {
   DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
 };
 
+using TraceID = trace_event_internal::TraceID;
+
 }  // namespace trace_event
 }  // namespace base