Merge "Fix Letterboxing for Transparent Activities" into tm-qpr-dev am: 86c6d900

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20139788



Change-Id: Ia4989828d59d51e6c65c99dca1dff9f0cfd9e025
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>