Merge "Mark @FlaggedApi flags as exported" into main am: fa78999cb7

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3380105

Change-Id: I25753edf4ca59208867c0fadea64011cb178b3ef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>