Merge "Revert "trancoding: lazy-start transcoding service"" into sc-dev am: 36da5805 am: babefcf5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14534458

Change-Id: I3ba33bf17ddb693caffafb546cc40d9c36d5c42c