Send kStopMark from AudioOutputController to stop AudioThread in renderer

content/renderer/media/audio_device.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/media/audio_device.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "base/time.h"
@@ skipping 281 matching lines @@
   int pending_data;
   const int samples_per_ms = static_cast<int>(sample_rate_) / 1000;
   const int bytes_per_ms = channels_ * (bits_per_sample_ / 8) * samples_per_ms;
 
   while (sizeof(pending_data) ==
       audio_socket->socket()->Receive(&pending_data, sizeof(pending_data))) {
     if (pending_data == media::AudioOutputController::kPauseMark) {
       memset(shared_memory.memory(), 0, memory_length_);
       media::SetActualDataSizeInBytes(&shared_memory, memory_length_, 0);
       continue;
-    } else if (pending_data < 0) {
+    } else if (pending_data == media::AudioOutputController::kStopMark ||
+               pending_data < 0) {
       break;
     }
 
     // Convert the number of pending bytes in the render buffer
     // into milliseconds.
     audio_delay_milliseconds_ = pending_data / bytes_per_ms;
     size_t num_frames = FireRenderCallback(
         reinterpret_cast<int16*>(shared_memory.memory()));
 
     // Let the host know we are done.
@@ skipping 33 matching lines @@
     // audio thread.
     audio_socket_->Close();
     audio_thread_->Join();
     // Make sure not to release the socket pointer until after the thread
     // has exited.  Otherwise there's a race between startup of the thread
     // and this.
     audio_socket_ = NULL;
     audio_thread_.reset(NULL);
   }
 }