Work-in-progress upload to add worker task queue to PC factory.

webrtc/pc/peerconnectionfactory.cc

Index: webrtc/pc/peerconnectionfactory.cc
diff --git a/webrtc/pc/peerconnectionfactory.cc b/webrtc/pc/peerconnectionfactory.cc
index 777bac1eb59aadd49bcc9af1d44ac66e9d02276f..c16c19feeb390b2e20e725d387d63a3a69419c97 100644
--- a/webrtc/pc/peerconnectionfactory.cc
+++ b/webrtc/pc/peerconnectionfactory.cc
@@ -139,6 +139,7 @@ PeerConnectionFactory::PeerConnectionFactory(
       network_thread_(rtc::Thread::CreateWithSocketServer().release()),
       worker_thread_(rtc::Thread::Create().release()),
       signaling_thread_(rtc::Thread::Current()),
+      low_priority_worker_queue_("low_prio_worker_queue"),
       audio_encoder_factory_(audio_encoder_factory),
       audio_decoder_factory_(audio_decoder_factory) {
   if (!signaling_thread_) {
@@ -164,6 +165,8 @@ PeerConnectionFactory::PeerConnectionFactory(
       network_thread_(network_thread),
       worker_thread_(worker_thread),
       signaling_thread_(signaling_thread),
+      low_priority_worker_queue_("low_prio_worker_queue",
+                                 rtc::TaskQueue::Priority::LOW),
       default_adm_(default_adm),
       audio_encoder_factory_(audio_encoder_factory),
       audio_decoder_factory_(audio_decoder_factory),
@@ -387,10 +390,9 @@ PeerConnectionFactory::CreateMediaEngine_w() {
   RTC_DCHECK(worker_thread_ == rtc::Thread::Current());
   return std::unique_ptr<cricket::MediaEngineInterface>(
       cricket::WebRtcMediaEngineFactory::Create(
-          default_adm_.get(), audio_encoder_factory_,
-          audio_decoder_factory_,
+          default_adm_.get(), audio_encoder_factory_, audio_decoder_factory_,
           video_encoder_factory_.get(), video_decoder_factory_.get(),
-          external_audio_mixer_));
+          external_audio_mixer_, &low_priority_worker_queue_));
 }
 
 }  // namespace webrtc