Merge "Export flags used in FlaggedApi annotations" into main am: e8ab42c773 am: 529edaceef

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2985533

Change-Id: Iee12d6912b25520ffe3226e75adc143ecb8ecc5f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>