LatencyInfo trace_id_ no longer dependent on sequence_number.

ui/latency/ipc/latency_info_param_traits.cc

 // Copyright 2014 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.
 
 #include "ui/gfx/ipc/geometry/gfx_param_traits.h"
 #include "ui/latency/ipc/latency_info_param_traits_macros.h"
 
 // Generate param traits size methods.
 #include "ipc/param_traits_size_macros.h"
 namespace IPC {
@@ skipping 25 matching lines @@
 // Implemetation for ParamTraits<ui::LatencyInfo>.
 #include "ui/latency/ipc/latency_info_param_traits.h"
 
 namespace IPC {
 
 void ParamTraits<ui::LatencyInfo>::GetSize(base::PickleSizer* s,
                                            const param_type& p) {
   GetParamSize(s, p.trace_name_);
   GetParamSize(s, p.latency_components_);
   GetParamSize(s, p.trace_id_);
+  GetParamSize(s, p.began_);
   GetParamSize(s, p.terminated_);
   GetParamSize(s, p.source_event_type_);
 }
 
 void ParamTraits<ui::LatencyInfo>::Write(base::Pickle* m, const param_type& p) {
   WriteParam(m, p.trace_name_);
   WriteParam(m, p.latency_components_);
   WriteParam(m, p.trace_id_);
+  WriteParam(m, p.began_);
   WriteParam(m, p.terminated_);
   WriteParam(m, p.source_event_type_);
 }
 
 bool ParamTraits<ui::LatencyInfo>::Read(const base::Pickle* m,
                                         base::PickleIterator* iter,
                                         param_type* p) {
   if (!ReadParam(m, iter, &p->trace_name_))
     return false;
   if (!ReadParam(m, iter, &p->latency_components_))
     return false;
 
   if (!ReadParam(m, iter, &p->trace_id_))
     return false;
+  if (!ReadParam(m, iter, &p->began_))
+    return false;
   if (!ReadParam(m, iter, &p->terminated_))
     return false;
   if (!ReadParam(m, iter, &p->source_event_type_))
     return false;
 
   return true;
 }
 
 void ParamTraits<ui::LatencyInfo>::Log(const param_type& p, std::string* l) {
   LogParam(p.trace_name_, l);
   l->append(" ");
   LogParam(p.latency_components_, l);
   l->append(" ");
   LogParam(p.trace_id_, l);
   l->append(" ");
+  LogParam(p.began_, l);
+  l->append(" ");
   LogParam(p.terminated_, l);
   l->append(" ");
   LogParam(p.source_event_type_, l);
 }
 
 }  // namespace IPC