Merge "Decoder: add support for KEEP_THREADS_ACTIVE" am: eb0e6acc60 am: 33be8ea9ce am: 795d9f12e6 am: d7d3dddb6b am: f6f03d6300

Original change: https://android-review.googlesource.com/c/platform/external/libmpeg2/+/1740742

Change-Id: I7d69a066469da82642d800f078c450e36315d006