Enable generation of local host candidate when RTCConfiguration is null.

content/renderer/media/rtc_peer_connection_handler.cc

Index: content/renderer/media/rtc_peer_connection_handler.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler.cc b/content/renderer/media/rtc_peer_connection_handler.cc
index 626e5c91eb70f8eac21a3230002662126aa386f1..df926eb4770b87d4ab375a1a1e853cf4d8724271 100644
--- a/content/renderer/media/rtc_peer_connection_handler.cc
+++ b/content/renderer/media/rtc_peer_connection_handler.cc
@@ -185,8 +185,20 @@ void GetSdpAndTypeFromSessionDescription(
 void GetNativeRtcConfiguration(
     const blink::WebRTCConfiguration& blink_config,
     webrtc::PeerConnectionInterface::RTCConfiguration* webrtc_config) {
-  if (blink_config.isNull() || !webrtc_config)
+  if (!webrtc_config)
     return;
+
+  // When we don't have WebRTCConfiguration, treat it as a special case where we
+  // should generate local host candidate. This will only be honored if
+  // enable_multiple_routes is disabled.
+  if (blink_config.isNull()) {
+    webrtc_config->enable_localhost_ice_candidate = true;
+    return;
+  }
+
+  webrtc_config->enable_localhost_ice_candidate =

[juberti, 2015/08/28 00:24:49]

What does this do, exactly?

+      blink_config.enableLocalhostCandidate();
+
   for (size_t i = 0; i < blink_config.numberOfServers(); ++i) {
     webrtc::PeerConnectionInterface::IceServer server;
     const blink::WebRTCICEServer& webkit_server =