Merge "transcoding: use background io priority" into sc-dev am: e2849833 am:...

Merge "transcoding: use background io priority" into sc-dev am: e2849833 am: c837ce5d am: b181ad4d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/14328561

Change-Id: I18e8bb45a0ca438606d6fd1f3b2493c19bc2b312