Mark public ObjC APIs as explicitly visible.
BUG=
Review URL: https://codereview.webrtc.org/1899573002
Cr-Commit-Position: refs/heads/master@{#12431}
diff --git a/webrtc/api/objc/RTCMediaStreamTrack.h b/webrtc/api/objc/RTCMediaStreamTrack.h
index b8576bd..5a0dcbf 100644
--- a/webrtc/api/objc/RTCMediaStreamTrack.h
+++ b/webrtc/api/objc/RTCMediaStreamTrack.h
@@ -10,6 +10,8 @@
#import <Foundation/Foundation.h>
+#import "webrtc/base/objc/RTCMacros.h"
+
/**
* Represents the state of the track. This exposes the same states in C++.
*/
@@ -20,6 +22,7 @@
NS_ASSUME_NONNULL_BEGIN
+RTC_EXPORT
@interface RTCMediaStreamTrack : NSObject
/**