Relanding Generate localhost candidate when no STUN/TURN and portallocator has the right flag spefi…

talk/app/webrtc/webrtcsession.cc

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 707 matching lines @@
       dtls_enabled_));
 
   webrtc_session_desc_factory_->SignalIdentityReady.connect(
       this, &WebRtcSession::OnIdentityReady);
 
   if (options.disable_encryption) {
     webrtc_session_desc_factory_->SetSdesPolicy(cricket::SEC_DISABLED);
   }
   port_allocator()->set_candidate_filter(
       ConvertIceTransportTypeToCandidateFilter(rtc_configuration.type));
+
+  if (rtc_configuration.enable_localhost_ice_candidate) {
+    port_allocator()->set_flags(
+        port_allocator()->flags() |
+        cricket::PORTALLOCATOR_ENABLE_LOCALHOST_CANDIDATE);
+  }
+
   return true;
 }
 
 void WebRtcSession::Terminate() {
   SetState(STATE_RECEIVEDTERMINATE);
   RemoveUnusedChannelsAndTransports(NULL);
   ASSERT(!voice_channel_);
   ASSERT(!video_channel_);
   ASSERT(!data_channel_);
 }
@@ skipping 1306 matching lines @@
 
   if (!srtp_cipher.empty()) {
     metrics_observer_->AddHistogramSample(srtp_name, srtp_cipher);
   }
   if (!ssl_cipher.empty()) {
     metrics_observer_->AddHistogramSample(ssl_name, ssl_cipher);
   }
 }
 
 }  // namespace webrtc