Changed PeerConnectionEndToEndTest to use a separate worker thread.

webrtc/api/test/peerconnectiontestwrapper.h

Index: webrtc/api/test/peerconnectiontestwrapper.h
diff --git a/webrtc/api/test/peerconnectiontestwrapper.h b/webrtc/api/test/peerconnectiontestwrapper.h
index 25510b2de079578711f15a59796dd0b91db1ebce..f744b57c223744415f8b1faa9c76c93da5bec935 100644
--- a/webrtc/api/test/peerconnectiontestwrapper.h
+++ b/webrtc/api/test/peerconnectiontestwrapper.h
@@ -25,7 +25,8 @@ class PeerConnectionTestWrapper
   static void Connect(PeerConnectionTestWrapper* caller,
                       PeerConnectionTestWrapper* callee);
 
-  explicit PeerConnectionTestWrapper(const std::string& name);
+  explicit PeerConnectionTestWrapper(const std::string& name,
+                                     rtc::Thread* worker_thread);
   virtual ~PeerConnectionTestWrapper();
 
   bool CreatePc(const webrtc::MediaConstraintsInterface* constraints);
@@ -88,6 +89,7 @@ class PeerConnectionTestWrapper
       bool video, const webrtc::FakeConstraints& video_constraints);
 
   std::string name_;
+  rtc::Thread* worker_thread_;
   rtc::scoped_refptr<webrtc::PeerConnectionInterface> peer_connection_;
   rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface>
       peer_connection_factory_;