Merge "Hide fullscreen button in partial only mode" into udc-dev am: edbdb977 am: 23ebb6a9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23087459



Change-Id: I728b13d176735acbd976101b23336a286c023f34
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>