Merge "Skip letterboxing if the activity below is embedded" into udc-dev am: 901e2ccf

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21809097



Change-Id: I32e29217a3a4d93d52203a3630875600b6709557
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>