Rewrite PeerConnection integration tests using better testing practices.

webrtc/pc/iceserverparsing.h

+/*
+ *  Copyright 2017 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.
+ */
+
+#ifndef WEBRTC_PC_ICESERVERPARSING_H_
+#define WEBRTC_PC_ICESERVERPARSING_H_
+
+#include <vector>
+
+#include "webrtc/api/peerconnectioninterface.h"
+#include "webrtc/api/rtcerror.h"
+
+namespace webrtc {
+
+// Parses the URLs for each server in |servers| to build |stun_servers| and
+// |turn_servers|. Can return SYNTAX_ERROR if the URL is malformed, or
+// INVALID_PARAMETER if a TURN server is missing |username| or |password|.
+//
+// Intended to be used to convert/validate the servers passed into a
+// PeerConnection through RTCConfiguration.
+RTCErrorType ParseIceServers(
+    const PeerConnectionInterface::IceServers& servers,
+    cricket::ServerAddresses* stun_servers,
+    std::vector<cricket::RelayServerConfig>* turn_servers);
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_PC_ICESERVERPARSING_H_