Merge "Do not apply letterbox when entering PiP" into udc-dev am: cceba8e2 am: f382b873

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23628060



Change-Id: I9c32fe6d17a61983a89e97d6c152395ad1082ec0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>