Just like the C++ API, add a method in Java VideoFrame.Buffer that describes the underlying implementation. Use this method to properly select AndroidVideoBuffer or AndroidVideoI420Buffer in Java -> C++ Video Frame Conversion. Also, add a test case for WrappedNativeI420Buffer in VideoFrameBufferTest for consistency. Bug: webrtc:12602 Change-Id: I4c0444e8af6f6a1109bc514e7ab6c2214f1f6d60 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/223080 Commit-Queue: Byoungchan Lee <daniel.l@hpcnt.com> Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Xavier Lepaul <xalep@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34545}