Allow passing both hostname and IP of ICE server into PeerConnection.

webrtc/pc/iceserverparsing.cc

Index: webrtc/pc/iceserverparsing.cc
diff --git a/webrtc/pc/iceserverparsing.cc b/webrtc/pc/iceserverparsing.cc
index 5769cee94e270e1448f139992c3833dc411d6a54..ac8764e0363a7683a4fc9ca83609b4291fd1bb7e 100644
--- a/webrtc/pc/iceserverparsing.cc
+++ b/webrtc/pc/iceserverparsing.cc
@@ -210,8 +210,8 @@ static RTCErrorType ParseIceServerUrl(
     turn_transport_type = cricket::PROTO_TLS;
   }
 
-  std::string address;
-  if (!ParseHostnameAndPortFromString(hoststring, &address, &port)) {
+  std::string hostname;
+  if (!ParseHostnameAndPortFromString(hoststring, &hostname, &port)) {
     LOG(WARNING) << "Invalid hostname format: " << uri_without_transport;
     return RTCErrorType::SYNTAX_ERROR;
   }
@@ -220,11 +220,18 @@ static RTCErrorType ParseIceServerUrl(
     LOG(WARNING) << "Invalid port: " << port;
     return RTCErrorType::SYNTAX_ERROR;
   }
+  rtc::SocketAddress address(hostname, port);
+  if (!server.ip.IsNil()) {
+    if (!address.IsUnresolvedIP() && address.ipaddr() != server.ip) {
+      return RTCErrorType::INVALID_PARAMETER;
+    }
+    address.SetResolvedIP(server.ip);
+  }
 
   switch (service_type) {
     case STUN:
     case STUNS:
-      stun_servers->insert(rtc::SocketAddress(address, port));
+      stun_servers->insert(address);
       break;
     case TURN:
     case TURNS: {
@@ -234,7 +241,7 @@ static RTCErrorType ParseIceServerUrl(
         return RTCErrorType::INVALID_PARAMETER;
       }
       cricket::RelayServerConfig config = cricket::RelayServerConfig(
-          address, port, username, server.password, turn_transport_type);
+          address, username, server.password, turn_transport_type);
       if (server.tls_cert_policy ==
           PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck) {
         config.tls_cert_policy =