[Tracing Clock Sync] Implement clock sync in Chrome

content/browser/tracing/battor_power_trace_provider.cc

 // 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.
 
 #include "content/browser/tracing/battor_power_trace_provider.h"
 
 namespace content {
 
 BattorPowerTraceProvider::BattorPowerTraceProvider() {}
 
 BattorPowerTraceProvider::~BattorPowerTraceProvider() {}
 
 bool BattorPowerTraceProvider::IsConnected() {
   return false;
 }
 
 bool BattorPowerTraceProvider::StartTracing() {
   return false;
 }
 
 bool BattorPowerTraceProvider::StopTracing() {
   return false;
 }
 
+void BattorPowerTraceProvider::RecordClockSyncMarker(int sync_id) {}
+
 void BattorPowerTraceProvider::GetLog(std::string* log_str) {
   // Get logs from battor.
   *log_str = "";
 }
 }