[BattOr] Make BattOr able to return firmware version.

content/browser/tracing/power_tracing_agent.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_POWER_TRACING_AGENT_H_
 #define CONTENT_BROWSER_TRACING_POWER_TRACING_AGENT_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 28 matching lines @@
 
   // base::trace_event::TracingAgent implementation.
   std::string GetTracingAgentName() override;
   std::string GetTraceEventLabel() override;
 
   // BattOrAgent::Listener implementation.
   void OnStartTracingComplete(battor::BattOrError error) override;
   void OnStopTracingComplete(const std::string& trace,
                              battor::BattOrError error) override;
   void OnRecordClockSyncMarkerComplete(battor::BattOrError error) override;
+  void OnGetFirmwareGitHashComplete(const std::string& version,
+                                    battor::BattOrError error) override;
 
  private:
   // This allows constructor and destructor to be private and usable only
   // by the Singleton class.
   friend struct base::DefaultSingletonTraits<PowerTracingAgent>;
 
   PowerTracingAgent();
   ~PowerTracingAgent() override;
 
   void FindBattOrOnFileThread(const StartAgentTracingCallback& callback);
@@ skipping 18 matching lines @@
   std::string record_clock_sync_marker_sync_id_;
   base::TimeTicks record_clock_sync_marker_start_time_;
   RecordClockSyncMarkerCallback record_clock_sync_marker_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerTracingAgent);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_POWER_TRACING_AGENT_H_