Add PeerConnection IsClosed check.

webrtc/api/peerconnectionfactory.cc

Index: webrtc/api/peerconnectionfactory.cc
diff --git a/webrtc/api/peerconnectionfactory.cc b/webrtc/api/peerconnectionfactory.cc
index a91589a98a55343f3bb0ec845337ddb443e05ab6..2717c0987de43ce5034170d8e872a9185e3e8733 100644
--- a/webrtc/api/peerconnectionfactory.cc
+++ b/webrtc/api/peerconnectionfactory.cc
@@ -189,7 +189,6 @@ bool PeerConnectionFactory::Initialize() {
 
   return true;
 }

[zhihuang1, 2016/06/01 21:11:21]

This empty line should not be deleted.

-
 rtc::scoped_refptr<AudioSourceInterface>
 PeerConnectionFactory::CreateAudioSource(
     const MediaConstraintsInterface* constraints) {
@@ -332,6 +331,13 @@ webrtc::MediaControllerInterface* PeerConnectionFactory::CreateMediaController(
                                           channel_manager_.get());
 }
 
+cricket::TransportController* PeerConnectionFactory::CreateTransportController(
+    cricket::PortAllocator* port_allocator) {
+  RTC_DCHECK(signaling_thread_->IsCurrent());
+  return new cricket::TransportController(signaling_thread_, network_thread_,
+                                          port_allocator);
+}
+
 rtc::Thread* PeerConnectionFactory::signaling_thread() {
   // This method can be called on a different thread when the factory is
   // created in CreatePeerConnectionFactory().