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When the user releases the mouse on a drag in ash, the new window must
go fullscreen if the source window was previously fullscreen. Instead of
directly fiddling with ash state for this, set the fullscreen bit on the
window, which will be synced.

Bug: 756091
Change-Id: I26df2c1932ec2e185d9cb527e573438cc26bafa0
Reviewed-on: https://chromium-review.googlesource.com/671656Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Elliot Glaysher <erg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502958}