Merge "Support decoding gainmaps to alpha8 with BitmapFactory." into udc-dev am: ba62f46d am: d2f15139 am: f250d76b am: 368cbe07

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23121580



Change-Id: I1fc8c3b4ebebb46176157f8a4e57b4864cae0aa7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>