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

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

Change-Id: I7a76997c34056249b72aa17bf95fbef2e09aa5d1