Merge "Always abort a rejected multiwindow request" into udc-qpr-dev am: b476c59df1 am: 8fd80a3b9f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24636630

Change-Id: I6f2980d1b54b54b2a909ca9296df16a2f746bda0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>