Merge "Sharesheet: action bar is independent of WP tabs, should always launch...

Merge "Sharesheet: action bar is independent of WP tabs, should always launch as primary user." into sc-dev am: 9197f7b2 am: 34ff8cde am: 8f3b2e1c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15363687

Change-Id: I827544acb99f4f5670339b796cfc47a83cc7eedd