Add MessageLoop::AssertIdle(). Use in ChromeOS audio threads.

chrome/browser/chromeos/audio_mixer_pulse.cc

 // Copyright (c) 2010 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 "chrome/browser/chromeos/audio_mixer_pulse.h"
 
 #include <pulse/pulseaudio.h>
 
 #include "base/logging.h"
+#include "base/message_loop.h"
 #include "base/task.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace chromeos {
 
 // Using asynchronous versions of the threaded PulseAudio API, as well
 // as a worker thread so gets, sets, and the init sequence do not block the
 // calling thread.  GetVolume() and IsMute() can still be called synchronously
 // if needed, but take a bit longer (~2ms vs ~0.3ms).
 //
@@ skipping 37 matching lines @@
       pa_mainloop_(NULL) {
 }
 
 AudioMixerPulse::~AudioMixerPulse() {
   PulseAudioFree();
   if (thread_ != NULL) {
     // A ScopedAllowIO object is required to join the thread when calling Stop.
     // The worker thread should be idle at this time.
     // See http://crosbug.com/11110 for discussion.
     base::ThreadRestrictions::ScopedAllowIO allow_io_for_thread_join;
+    thread_->message_loop()->AssertIdle();
 
     thread_->Stop();
     thread_.reset();
   }
 }
 
 void AudioMixerPulse::Init(InitDoneCallback* callback) {
   DCHECK(callback);
   if (!InitThread()) {
     callback->Run(false);
@@ skipping 384 matching lines @@
   if (mixer_state_ != READY)
     return false;
   if (!pa_mainloop_)
     return false;
   pa_threaded_mainloop_lock(pa_mainloop_);
   ++mainloop_lock_count_;
   return true;
 }
 
 }  // namespace chromeos
-