Merge "Fix customized activity open/close animation backdrop color" into...

Merge "Fix customized activity open/close animation backdrop color" into tm-qpr-dev am: 53c5aa67 am: b735a1cb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20662608



Change-Id: Id52142b5140735adb3680b86f549705dfe43a67a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>