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This CL adds animation to Sharesheet appear and disappear.
Appear has a opacity fade in from 0 - 100 in 100ms with linear curve
and scale fade in 80-100% in 150ms with curve (0.4,0,0.2,1).
Disappear is a 100-0 in 80ms linear opacity fade out.

In this CL we also disable sharesheet close on deactivate
when ShareActions have been selected.

Bug: 1148692
Change-Id: Id6a360438271ad62f5911ed97984c3230a448332
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537502
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828107}