LatencyInfo trace_id_ no longer dependent on sequence_number.

ui/latency/mojo/latency_info_struct_traits.cc

 // Copyright 2016 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/latency/mojo/latency_info_struct_traits.h"
 
 #include "ipc/ipc_message_utils.h"
 
 namespace mojo {
 
@@ skipping 273 matching lines @@
   return info.trace_id();
 }
 
 // static
 bool StructTraits<ui::mojom::LatencyInfoDataView, ui::LatencyInfo>::coalesced(
     const ui::LatencyInfo& info) {
   return info.coalesced();
 }
 
 // static
+bool StructTraits<ui::mojom::LatencyInfoDataView, ui::LatencyInfo>::began(
+    const ui::LatencyInfo& info) {
+  return info.began();
+}
+
+// static
 bool StructTraits<ui::mojom::LatencyInfoDataView, ui::LatencyInfo>::terminated(
     const ui::LatencyInfo& info) {
   return info.terminated();
 }
 
 // static
 ui::mojom::SourceEventType
 StructTraits<ui::mojom::LatencyInfoDataView,
              ui::LatencyInfo>::source_event_type(const ui::LatencyInfo& info) {
   return UISourceEventTypeToMojo(info.source_event_type());
@@ skipping 14 matching lines @@
     ui::LatencyInfo::LatencyMap::key_type key;
     if (!component_pair.ReadKey(&key))
       return false;
     auto& value = out->latency_components_[key];
     if (!component_pair.ReadValue(&value))
       return false;
   }
 
   out->trace_id_ = data.trace_id();
   out->coalesced_ = data.coalesced();
+  out->began_ = data.began();
   out->terminated_ = data.terminated();
   out->source_event_type_ = MojoSourceEventTypeToUI(data.source_event_type());
   return true;
 }
 
 }  // namespace mojo