Merge "Add shell command for setting the game mode for a package" into sc-dev...

Merge "Add shell command for setting the game mode for a package" into sc-dev am: 9bfb0f38 am: b2ee708b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14521282

Change-Id: If06be3c2302a20e69c8b99a35d04ec6f35f6a45b