Make native VideoTrack pointer public

Is useful for app that has parts in java and parts in native,
that can pass down native pointer rather than java object,
and get the native pointer using up-call.

Many/most other objects expose their native pointer
for these use cases.

BUG=None

Change-Id: I352d4de388525abb09733d38b6af6651770d0498
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/307460
Reviewed-by: Xavier Lepaul‎ <xalep@webrtc.org>
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40203}
diff --git a/sdk/android/api/org/webrtc/VideoTrack.java b/sdk/android/api/org/webrtc/VideoTrack.java
index 5593d42..512e46c 100644
--- a/sdk/android/api/org/webrtc/VideoTrack.java
+++ b/sdk/android/api/org/webrtc/VideoTrack.java
@@ -65,7 +65,7 @@
   }
 
   /** Returns a pointer to webrtc::VideoTrackInterface. */
-  long getNativeVideoTrack() {
+  public long getNativeVideoTrack() {
     return getNativeMediaStreamTrack();
   }