Show escape toast when swipe up or quick scrub while pinned

When pinned, trying to start quick scrub or swipe up will show the toast
to tell the user how to exit pinned mode. When user continues to hold
down on the screen after trying to execute gesture and toast appears, it
will not show the toast again.

Test: pin, swipe up or quick scrub
Change-Id: Ia32f174d1c36d1f773a038353fbedc3525c8ea75
Fixes: 80002494