Merge "Make IActivityManager.killPids asynchronized" into sc-dev am: 96d2926f am: 20efaac3 am: dc9d96a8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14939780

Change-Id: I294111d754906350117d0cee13b852b8c9ee2c40