Accept remote offers with current DTLS role, rather than "actpass".

webrtc/p2p/base/transportcontroller.cc

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 503 matching lines @@
 }
 
 bool TransportController::GetSslRole_n(const std::string& transport_name,
                                        rtc::SSLRole* role) const {
   RTC_DCHECK(network_thread_->IsCurrent());
 
   const JsepTransport* t = GetJsepTransport(transport_name);
   if (!t) {
     return false;
   }
-  t->GetSslRole(role);
+  rtc::Optional<rtc::SSLRole> current_role = t->GetSslRole();
+  if (!current_role) {
+    return false;
+  }
+  *role = *current_role;
   return true;
 }
 
 bool TransportController::SetLocalCertificate_n(
     const rtc::scoped_refptr<rtc::RTCCertificate>& certificate) {
   RTC_DCHECK(network_thread_->IsCurrent());
 
   // Can't change a certificate, or set a null certificate.
   if (certificate_ || !certificate) {
     return false;
@@ skipping 344 matching lines @@
         RTC_FROM_HERE, this, MSG_ICEGATHERINGSTATE,
         new rtc::TypedMessageData<IceGatheringState>(new_gathering_state));
   }
 }
 
 void TransportController::OnDtlsHandshakeError(rtc::SSLHandshakeError error) {
   SignalDtlsHandshakeError(error);
 }
 
 }  // namespace cricket