Sharesheet - alter entrance animation

And delay and slow down entrance animation to give more leeway
for icons to load. Simplest approach is to use styles. In the
future may be needed to pull into Chooser/Resolver.

Fixes: 131753649
Test: visual
Change-Id: I60de95d98b1ba6adadabe4198dc7edc15f9c248b
4 files changed