Pass around the candidate removals events in IOS clients

webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h

Index: webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h b/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h
index 18eafe26736517f85f675ec0c7e5700da9bb69ec..45adfe6a0b205b4725870d47ca0a490276124225 100644
--- a/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h
+++ b/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h
@@ -15,6 +15,7 @@
 
 typedef enum {
   kARDSignalingMessageTypeCandidate,
+  kARDSignalingMessageTypeCandidatesRemoval,

[tkchin_webrtc, 2016/05/16 20:48:58]

nit: CandidateRemoval

[honghaiz3, 2016/05/17 00:46:52]

I understand this may appear grammatically incorrect, but I chose this to
emphasize that this message is for removing a list of candidates instead of
single candidate.

[tkchin_webrtc, 2016/05/17 02:01:43]

I think it is ok to use CandidateRemoval because the ctor only takes an array,
and the only exposed property is also an array, so it should be clear to any
user. Makes it easier to read for me. But up to you.

[honghaiz3, 2016/05/17 06:11:23]

Done.

   kARDSignalingMessageTypeOffer,
   kARDSignalingMessageTypeAnswer,
   kARDSignalingMessageTypeBye,
@@ -37,6 +38,15 @@ typedef enum {
 
 @end
 
+@interface ARDICECandidatesRemovalMessage : ARDSignalingMessage

[tkchin_webrtc, 2016/05/16 20:48:58]

nit: ARDICECandidateRemovalMessage

[honghaiz3, 2016/05/17 00:46:52]

Same as above.

+
+@property(nonatomic, readonly) NSArray<RTCIceCandidate *> *candidates;
+
+- (instancetype)initWithRemovedCandidates:
+    (NSArray<RTCIceCandidate *> *)candidates;
+
+@end
+
 @interface ARDSessionDescriptionMessage : ARDSignalingMessage
 
 @property(nonatomic, readonly) RTCSessionDescription *sessionDescription;