Stop the AudioDeviceThread when the IO loop goes away.

content/renderer/media/audio_input_device.cc

Index: content/renderer/media/audio_input_device.cc
diff --git a/content/renderer/media/audio_input_device.cc b/content/renderer/media/audio_input_device.cc
index 95ade0831460deeb4fd6ebe49177d50b8e7edf83..88c9b1f8af27db8d9020385ab74b02890a2e25a6 100644
--- a/content/renderer/media/audio_input_device.cc
+++ b/content/renderer/media/audio_input_device.cc
@@ -146,6 +146,12 @@ void AudioInputDevice::ShutDownOnIOThread() {
     session_id_ = 0;
     pending_device_ready_ = false;
   }
+
+  // We can run into an issue where ShutDownOnIOThread is called right after
+  // OnStreamCreated is called in cases where Start/Stop are called before we
+  // get the OnStreamCreated callback.  To handle that corner case, we call
+  // Stop(). In most cases, the thread will already be stopped.
+  audio_thread_.Stop(MessageLoop::current());
   audio_callback_.reset();
 }
 
@@ -178,11 +184,11 @@ void AudioInputDevice::OnStreamCreated(
     return;
   }
 
+  DCHECK(audio_thread_.IsStopped());
   audio_callback_.reset(
       new AudioInputDevice::AudioThreadCallback(audio_parameters_, handle,
                                                 length, callback_));
-  audio_thread_.Start(audio_callback_.get(), socket_handle,
-                       "AudioInputDevice");
+  audio_thread_.Start(audio_callback_.get(), socket_handle, "AudioInputDevice");
 
   MessageLoop::current()->PostTask(FROM_HERE,
       base::Bind(&AudioInputDevice::StartOnIOThread, this));
@@ -258,6 +264,8 @@ void AudioInputDevice::Send(IPC::Message* message) {
 }
 
 void AudioInputDevice::WillDestroyCurrentMessageLoop() {

[scherkus (not reviewing), 2012/02/29 21:10:15]

ditto

+  LOG(ERROR) << "IO loop going away before the input device has been stopped";
+  audio_thread_.Stop(NULL);
   ShutDownOnIOThread();
 }