Mash: propagate kAnimationsDisabled window property

Some windows, including tab-dragging window, want to suppress
the window animations. This property needs to be propagated
to Ash to take an effect.

BUG=867074
TEST=manually

Change-Id: I80847702e26cd04981cac71b02114389312d83e1
Reviewed-on: https://chromium-review.googlesource.com/1166331
Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581896}
2 files changed