Introduce new constructor to PlatformThread.

webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 63 matching lines @@
   // This function MUST be called once a STOP_FILE message is added to the
   // signalling queue. The function will make sure that the output thread
   // wakes up to read the message, and it blocks until the output thread has
   // finished writing to the file.
   void WaitForFileFinished();
 
   // This fuction MUST be called once an event is added to the event queue.
   void SignalNewEvent();
 
  private:
-  static bool ThreadOutputFunction(void* obj);
+  static void ThreadOutputFunction(void* obj);
 
   bool AppendEventToString(rtclog::Event* event);
   bool LogToMemory();
   void StartLogFile();
   bool LogToFile();
   void StopLogFile();
   void ProcessEvents();
 
   // Message queues for passing events to the logging thread.
   SwapQueue<ControlMessage>* message_queue_;
@@ skipping 24 matching lines @@
   rtc::Event file_finished_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RtcEventLogHelperThread);
 };
 
 }  // namespace webrtc
 
 #endif  // ENABLE_RTC_EVENT_LOG
 
 #endif  // WEBRTC_LOGGING_RTC_EVENT_LOG_RTC_EVENT_LOG_HELPER_THREAD_H_