GitLab

When doing the move-window-to-desk animation, we should
animate the entire transient window tree, rather than a
single transient child.

Also, reduce animation duration based on UX feedback.

BUG=977434
TEST=Manually

Change-Id: I409bcd0c0ae18c97f8070259cf3a20eb99cf239c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1711622
Auto-Submit: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679594}