Introduce new constructor to PlatformThread.

webrtc/system_wrappers/source/critical_section_unittest.cc

 /*
  *  Copyright (c) 2012 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 50 matching lines @@
     // test both fast and non-flaky.
     // With 1 us wait as the switch, up to 7 rounds have been observed.
     while (count->Count() < target && loop_counter < 100 * target) {
       ++loop_counter;
       SwitchProcess();
     }
     return (count->Count() >= target);
   }
 };
 
-bool LockUnlockThenStopRunFunction(void* obj) {
+void LockUnlockThenStopRunFunction(void* obj) {
   ProtectedCount* the_count = static_cast<ProtectedCount*>(obj);
   the_count->Increment();
-  return false;
 }
 
 TEST_F(CritSectTest, ThreadWakesOnce) NO_THREAD_SAFETY_ANALYSIS {
   CriticalSectionWrapper* crit_sect =
       CriticalSectionWrapper::CreateCriticalSection();
   ProtectedCount count(crit_sect);
   rtc::PlatformThread thread(
       &LockUnlockThenStopRunFunction, &count, "ThreadWakesOnce");
   crit_sect->Enter();
   thread.Start();
@@ skipping 43 matching lines @@
 
   SwitchProcess();
   EXPECT_TRUE(WaitForCount(count_before + 1, &count));
   thread.Stop();
   delete crit_sect;
 }
 
 }  // anonymous namespace
 
 }  // namespace webrtc