Mark public ObjC APIs as explicitly visible.

webrtc/api/objc/RTCPeerConnection.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/base/objc/RTCMacros.h"
+
 @class RTCConfiguration;
 @class RTCDataChannel;
 @class RTCDataChannelConfiguration;
 @class RTCIceCandidate;
 @class RTCMediaConstraints;
 @class RTCMediaStream;
 @class RTCMediaStreamTrack;
 @class RTCPeerConnectionFactory;
 @class RTCRtpSender;
 @class RTCSessionDescription;
@@ skipping 35 matching lines @@
 };
 
 /** Represents the stats output level. */
 typedef NS_ENUM(NSInteger, RTCStatsOutputLevel) {
   RTCStatsOutputLevelStandard,
   RTCStatsOutputLevelDebug,
 };
 
 @class RTCPeerConnection;
 
+RTC_EXPORT
 @protocol RTCPeerConnectionDelegate <NSObject>
 
 /** Called when the SignalingState changed. */
 - (void)peerConnection:(RTCPeerConnection *)peerConnection
     didChangeSignalingState:(RTCSignalingState)stateChanged;
 
 /** Called when media is received on a new stream from remote peer. */
 - (void)peerConnection:(RTCPeerConnection *)peerConnection
           didAddStream:(RTCMediaStream *)stream;
 
@@ skipping 15 matching lines @@
 /** New ice candidate has been found. */
 - (void)peerConnection:(RTCPeerConnection *)peerConnection
     didGenerateIceCandidate:(RTCIceCandidate *)candidate;
 
 /** New data channel has been opened. */
 - (void)peerConnection:(RTCPeerConnection *)peerConnection
     didOpenDataChannel:(RTCDataChannel *)dataChannel;
 
 @end
 
-
+RTC_EXPORT
 @interface RTCPeerConnection : NSObject
 
 /** The object that will be notifed about events such as state changes and
  *  streams being added or removed.
  */
 @property(nonatomic, weak, nullable) id<RTCPeerConnectionDelegate> delegate;
 @property(nonatomic, readonly) NSArray *localStreams;
 @property(nonatomic, readonly, nullable)
     RTCSessionDescription *localDescription;
 @property(nonatomic, readonly, nullable)
@@ skipping 69 matching lines @@
  */
 - (void)statsForTrack:
     (nullable RTCMediaStreamTrack *)mediaStreamTrack
      statsOutputLevel:(RTCStatsOutputLevel)statsOutputLevel
     completionHandler:
     (nullable void (^)(NSArray<RTCStatsReport *> *stats))completionHandler;
 
 @end
 
 NS_ASSUME_NONNULL_END