Require username and credential for turn/turns

third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
index cec5ec646db74c233a3f9939e7f0c058b77d2a72..4ad8b8a126d72b905f7fb4946d1c4cad25e75fa1 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
@@ -315,6 +315,13 @@ WebRTCConfiguration parseConfiguration(ExecutionContext* context,
                   "\". URL scheme must be \"stun\", \"turn\" or \"turns\".");
           return WebRTCConfiguration();
         }
+        if ((url.protocolIs("turn") || url.protocolIs("turns")) &&
+            (username.isNull() || credential.isNull())) {
+          exceptionState.throwDOMException(InvalidAccessError,
+                                           "Both username and credential are "
+                                           "required when the URL scheme is "
+                                           "\"turn\" or \"turns\".");
+        }
         iceServers.append(WebRTCIceServer{url, username, credential});
       }
     }