Merge "Stop blocking broadcast receiver thread" into udc-dev am: 2ea28e4c am: c74412ed

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21866679



Change-Id: I7a456d7c42d23820570febd5376144886f4094f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>