Merge "MediaMuxer: add wrapper for MediaMuxer constructor" am: c8c8ddea9b am: 4fc8f9cb96

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1842949

Change-Id: Iaf439471b1bcc31965236a36aa7390db62b2b19d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>