Implement new PeerConnection certificate policy API in ObjC API

webrtc/sdk/objc/Framework/Headers/WebRTC/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>
 
 #import <WebRTC/RTCMacros.h>
 
+typedef NS_ENUM(NSUInteger, RTCTlsCertPolicy) {
+  RTCTlsCertPolicySecure,
+  RTCTlsCertPolicyInsecureNoCheck
+};
+
 NS_ASSUME_NONNULL_BEGIN
 
 RTC_EXPORT
 @interface RTCIceServer : NSObject
 
 /** URI(s) for this server represented as NSStrings. */
 @property(nonatomic, readonly) NSArray<NSString *> *urlStrings;
 
 /** Username to use if this RTCIceServer object is a TURN server. */
 @property(nonatomic, readonly, nullable) NSString *username;
 
 /** Credential to use if this RTCIceServer object is a TURN server. */
 @property(nonatomic, readonly, nullable) NSString *credential;
 
+/** TLS certificate policy to use if this RTCIceServer object is a TURN server.

[daniela-webrtc, 2017/02/01 14:26:53]

Move this to the next line to formulate the comment like so
/**
 * TLS certificate policy to use...
 */

[hnsl1, 2017/02/01 16:11:47]

Done.

+ */
+@property(nonatomic, readonly) RTCTlsCertPolicy tlsCertPolicy;
+
 - (nonnull instancetype)init NS_UNAVAILABLE;
 
 /** Convenience initializer for a server with no authentication (e.g. STUN). */
 - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings;
 
 /**
  * Initialize an RTCIceServer with its associated URLs, optional username,
  * optional credential, and credentialType.
  */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
+- (instancetype)initWithURLStrings:(NSArray<NSString*>*)urlStrings
+                          username:(nullable NSString*)username
+                        credential:(nullable NSString*)credential;
+
+/**
+ * Initialize an RTCIceServer with its associated URLs, optional username,
+ * optional credential, and TLS cert policy.
+ */
+- (instancetype)initWithURLStrings:(NSArray<NSString*>*)urlStrings
+                          username:(nullable NSString*)username
+                        credential:(nullable NSString*)credential
+                     tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
     NS_DESIGNATED_INITIALIZER;
 
 @end
 
 NS_ASSUME_NONNULL_END