Implement frame attribution (FrameBlamer)

base/trace_event/trace_event.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_H_
 #define BASE_TRACE_EVENT_TRACE_EVENT_H_
 
 // This header file defines implementation details of how the trace macros in
 // trace_event_common.h collect and store trace events. Anything not
 // implementation-specific should go in trace_macros_common.h instead of here.
@@ skipping 953 matching lines @@
 template<typename IDType> class TraceScopedTrackableObject {
  public:
   TraceScopedTrackableObject(const char* category_group, const char* name,
       IDType id)
     : category_group_(category_group),
       name_(name),
       id_(id) {
     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);
   }
 
   ~TraceScopedTrackableObject() {
     TRACE_EVENT_OBJECT_DELETED_WITH_ID(category_group_, name_, id_);
   }
 
  private:
   const char* category_group_;
   const char* name_;
   IDType id_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
 };
 
+using TraceID = trace_event_internal::TraceID;
+
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_H_