Merge "SF: Set dirty region bit if transparent region hint changes" into sc-dev am: 5b20104681 am: 4c5cf99db7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15240432

Change-Id: I8ec66994c71bce791657aa1fc9e9f61623d6a958