Update API for Objective-C RTCAudioTrack and RTCVideoTrack.

webrtc/api/objc/RTCMediaStreamTrack.mm

 /*
  *  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 "RTCMediaStreamTrack.h"
 
 #import "webrtc/api/objc/RTCMediaStreamTrack+Private.h"
 #import "webrtc/base/objc/NSString+StdString.h"
 
 @implementation RTCMediaStreamTrack {
   rtc::scoped_refptr<webrtc::MediaStreamTrackInterface> _nativeTrack;
+  RTCMediaStreamTrackType _type;
 }
 
 - (NSString *)kind {
   return [NSString stringForStdString:_nativeTrack->kind()];
 }
 
 - (NSString *)trackId {
   return [NSString stringForStdString:_nativeTrack->id()];
 }
 
@@ skipping 18 matching lines @@
                                     readyState];
 }
 
 #pragma mark - Private
 
 - (rtc::scoped_refptr<webrtc::MediaStreamTrackInterface>)nativeTrack {
   return _nativeTrack;
 }
 
 - (instancetype)initWithNativeTrack:
-    (rtc::scoped_refptr<webrtc::MediaStreamTrackInterface>)nativeTrack {
+    (rtc::scoped_refptr<webrtc::MediaStreamTrackInterface>)nativeTrack
+                               type:(RTCMediaStreamTrackType)type {
   NSParameterAssert(nativeTrack);
   if (self = [super init]) {
     _nativeTrack = nativeTrack;
+    _type = type;
   }
   return self;
 }
 
 + (webrtc::MediaStreamTrackInterface::TrackState)nativeTrackStateForState:
     (RTCMediaStreamTrackState)state {
   switch (state) {
     case RTCMediaStreamTrackStateInitializing:
       return webrtc::MediaStreamTrackInterface::kInitializing;
     case RTCMediaStreamTrackStateLive:
@@ skipping 26 matching lines @@
     case RTCMediaStreamTrackStateLive:
       return @"Live";
     case RTCMediaStreamTrackStateEnded:
       return @"Ended";
     case RTCMediaStreamTrackStateFailed:
       return @"Failed";
   }
 }
 
 @end