Introduce new constructor to PlatformThread.

webrtc/modules/video_coding/frame_buffer2_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 145 matching lines @@
     ASSERT_EQ(picture_id, frames_[index]->picture_id);
     ASSERT_EQ(spatial_layer, frames_[index]->spatial_layer);
   }
 
   void CheckNoFrame(size_t index) {
     rtc::CritScope lock(&crit_);
     ASSERT_LT(index, frames_.size());
     ASSERT_FALSE(frames_[index]);
   }
 
-  static bool ExtractLoop(void* obj) {
+  static void ExtractLoop(void* obj) {
     TestFrameBuffer2* tfb = static_cast<TestFrameBuffer2*>(obj);
     while (true) {
       tfb->trigger_extract_event_.Wait(rtc::Event::kForever);
       {
         rtc::CritScope lock(&tfb->crit_);
         tfb->crit_acquired_event_.Set();
         if (tfb->tear_down_)
-          return false;
+          return;
 
         std::unique_ptr<FrameObject> frame;
         FrameBuffer::ReturnReason res =
             tfb->buffer_.NextFrame(tfb->max_wait_time_, &frame);
         if (res != FrameBuffer::ReturnReason::kStopped)
           tfb->frames_.emplace_back(std::move(frame));
       }
     }
   }
 
@@ skipping 247 matching lines @@
   // Jump back in pid but increase ts.
   EXPECT_EQ(pid - 1, InsertFrame(pid - 1, 0, ts + 2, false));
   ExtractFrame();
   ExtractFrame();
   CheckFrame(1, pid - 1, 0);
   CheckNoFrame(2);
 }
 
 }  // namespace video_coding
 }  // namespace webrtc