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

webrtc/pc/peerconnectionfactory.h

Index: webrtc/pc/peerconnectionfactory.h
diff --git a/webrtc/pc/peerconnectionfactory.h b/webrtc/pc/peerconnectionfactory.h
index 0bf05bd714dcee95430b89f85d08cb2487e04f2e..c3accb45cfb8e730efa10b2fa0124d4520fca04d 100644
--- a/webrtc/pc/peerconnectionfactory.h
+++ b/webrtc/pc/peerconnectionfactory.h
@@ -16,9 +16,10 @@
 
 #include "webrtc/api/mediastreaminterface.h"
 #include "webrtc/api/peerconnectioninterface.h"
+#include "webrtc/base/rtccertificategenerator.h"
 #include "webrtc/base/scoped_ref_ptr.h"
+#include "webrtc/base/task_queue.h"
 #include "webrtc/base/thread.h"
-#include "webrtc/base/rtccertificategenerator.h"
 #include "webrtc/pc/channelmanager.h"
 
 namespace rtc {
@@ -129,6 +130,7 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
   rtc::Thread* worker_thread_;
   rtc::Thread* signaling_thread_;
   Options options_;
+  rtc::TaskQueue low_priority_worker_queue_;
   // External Audio device used for audio playback.
   rtc::scoped_refptr<AudioDeviceModule> default_adm_;
   rtc::scoped_refptr<AudioEncoderFactory> audio_encoder_factory_;