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/RTCRtpParameters.h b/webrtc/api/objc/RTCRtpParameters.h
index d38e9ef..91d8108 100644
--- a/webrtc/api/objc/RTCRtpParameters.h
+++ b/webrtc/api/objc/RTCRtpParameters.h
@@ -11,9 +11,11 @@
#import <Foundation/Foundation.h>
#import "webrtc/api/objc/RTCRtpEncodingParameters.h"
+#import "webrtc/base/objc/RTCMacros.h"
NS_ASSUME_NONNULL_BEGIN
+RTC_EXPORT
@interface RTCRtpParameters : NSObject
/** The currently active encodings in the order of preference. */