iOS - Add iceRegatherIntervalRange.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCConfiguration.h

Index: webrtc/sdk/objc/Framework/Headers/WebRTC/RTCConfiguration.h
diff --git a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCConfiguration.h b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCConfiguration.h
index 862a01d4f624caf10726ef69aa1920a7daa83421..17d79b2ed944c60e592a7a01e2b91bf31ed5ab4f 100644
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCConfiguration.h
+++ b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCConfiguration.h
@@ -13,6 +13,7 @@
 #import <WebRTC/RTCMacros.h>
 
 @class RTCIceServer;
+@class RTCIntervalRange;
 
 /**
  * Represents the ice transport policy. This exposes the same states in C++,
@@ -109,6 +110,13 @@ RTC_EXPORT
  */
 @property(nonatomic, copy, nullable) NSNumber *iceCheckMinInterval;
 
+/** ICE Periodic Regathering
+ *  If set, WebRTC will periodically create and propose candidates without
+ *  starting a new ICE generation. The regathering happens continuously with
+ *  interval specified in milliseconds by the uniform distribution [a, b].
+ */
+@property(nonatomic, strong, nullable) RTCIntervalRange *iceRegatherIntervalRange;
+
 - (instancetype)init;
 
 @end