Merge "Call ActivityTaskManagerService's version of hasSystemAlertWindowPermission()." into sc-dev am: c264f71b am: beb7ef80

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13933466

Change-Id: I16f3dda6a31745a0b2842848248276aa4d4b833b