Merge "Unit tests for Multi-Default with Existing APIs" am: ed4288b164 am: 372d3e6868 am: 4b7b85456a

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1579208

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ibae6928e620a5029986b71b2cf13c3137d39be9d