Add implementation and tests for RTCIceServer

webrtc/api/objc/RTCIceServer.h

+/*
+ *  Copyright 2015 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCIceServer : NSObject
+
+/** URI(s) for this server represented as NSStrings. */
+@property(nonatomic, copy, readonly) NSArray<NSString *> *urls;

[tkchin_webrtc, 2015/12/04 20:17:09]

nit: add blank line between property declaration and next comment.

[hjon, 2015/12/07 20:03:52]

Done.

+/** Username to use if this RTCIceServer object is a TURN server. */
+@property(nonatomic, copy, readonly, nullable) NSString *username;
+/** Credential to use if this RTCIceServer object is a TURN server. */
+@property(nonatomic, copy, readonly, nullable) NSString *credential;
+
+- (instancetype)init NS_UNAVAILABLE;
+/**

[tkchin_webrtc, 2015/12/04 20:17:09]

nit: blank line between method / next method's comment

[hjon, 2015/12/07 20:03:52]

Done.

+ * Convenience initializer for a server with no authentication (e.g. STUN). Sets
+ * |credentialType| to RTCIceCredentialTypeNone.

[tkchin_webrtc, 2015/12/04 20:17:09]

update comment.

[hjon, 2015/12/07 20:03:52]

Done.

+ */
+- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urls;
+/**
+ * Initialize an RTCIceServer with its associated URLs, optional username,
+ * optional credential, and credentialType.
+ */
+- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urls
+                          username:(nullable NSString *)username
+                        credential:(nullable NSString *)credential
+    NS_DESIGNATED_INITIALIZER;
+
+@end
+
+NS_ASSUME_NONNULL_END