Merge "Merge "Add new Flag class. New FlagReaderPlugin." into sc-v2-dev am:...

Merge "Merge "Add new Flag class. New FlagReaderPlugin." into sc-v2-dev am: d80f48c3" into sc-v2-dev-plus-aosp am: 1f9b5e8b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15405311

Change-Id: I039405a14fdfb521cdb9bca710ef5f9ed50465ee