Merge "Run LowpanManager on BackgroundThread" am: e9c000eee2 am: f4e6668082

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1513142

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3c501da3c8a7b5217d1574d5e7e4e41e0535e227