When a user is blocked, the toast message provides insufficent information to
the user. To provide more information, as well as a better design, the block
message will be moved into a drawer.
Bug: T165535
Change-Id: Ib025db3a8a4d1fd7bd05b69f9b5326943288372f
Depends-On: I926918d0bd7f2176f188a2154dc5e99f6a8a7ad1
David Barratt