Merge "identity: Add multi-document presentation support." am: 91b96e3454 am: ae0d53c78d am: 62c776a7c2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1824674

Change-Id: Idb4d1ddd89a5ca58ccc852c67f098dad04cb1c5c