Show discovery tip for hybrid hotseat

Doc: go/hybrid-hotseat-tips

Issue 157683315: for fully populated hotseat, count returns to home screen and show discovery tip if Tip action was not tapped.
Issue 158301717: Don't use cached items if client has predicted items.

Test: Manual
Change-Id: I4747a1148caa62a6262fb6592d5185bdf216ede6