Merge "Add support for manifest based opt-in for game modes" into sc-dev am:...

Merge "Add support for manifest based opt-in for game modes" into sc-dev am: 6dbd56f8 am: 1a4384c4 am: 6ec9e3be

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14174058

Change-Id: I9552c2aae57a93e6cd5c59e73e49e94b5cc4f3d5