[Tracing Clock Sync] Implement clock sync in Chrome

content/browser/tracing/battor_power_trace_provider.h

 // Copyright 2015 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 CONTENT_BROWSER_TRACING_BATTOR_POWER_TRACE_PROVIDER_H_
 #define CONTENT_BROWSER_TRACING_BATTOR_POWER_TRACE_PROVIDER_H_
 
 #include <string>
 
 #include "base/macros.h"
 
 namespace content {
 
 // This class handles the connection with the battor h/w using
 // chrome serial port interfaces.
-// TODO (aschulman) port over battor C code.
+// TODO(charliea): port over battor C code.
 class BattorPowerTraceProvider {
  public:
   BattorPowerTraceProvider();
   bool IsConnected();
   bool StartTracing();
   bool StopTracing();
+  void RecordClockSyncMarker(int sync_id);
   void GetLog(std::string* log_str);
   ~BattorPowerTraceProvider();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BattorPowerTraceProvider);
 };
 }
 #endif  // CONTENT_BROWSER_TRACING_BATTOR_POWER_TRACE_PROVIDER_H_