Introduce new constructor to PlatformThread.

webrtc/base/rate_limiter_unittest.cc

 /*
  *  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 112 matching lines @@
     end_signal_.Set();
   }
 
   virtual void DoRun() = 0;
 
   RateLimiter* const rate_limiter_;
   rtc::Event start_signal_;
   rtc::Event end_signal_;
 };
 
-bool RunTask(void* thread_task) {
+void RunTask(void* thread_task) {
   reinterpret_cast<ThreadTask*>(thread_task)->Run();
-  return false;
 }
 
 TEST_F(RateLimitTest, MultiThreadedUsage) {
   // Simple sanity test, with different threads calling the various methods.
   // Runs a few simple tasks, each on its own thread, but coordinated with
   // events so that they run in a serialized order. Intended to catch data
   // races when run with tsan et al.
 
   // Half window size, double rate -> same amount of bytes needed to fill rate.
 
@@ skipping 49 matching lines @@
 
   // All rate consumed.
   EXPECT_FALSE(rate_limiter->TryUseRate(1));
 
   thread1.Stop();
   thread2.Stop();
   thread3.Stop();
 }
 
 }  // namespace webrtc