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Otherwise |screen_orientation_| might not have the correct screen
orientation. For example:
- In landscape mode, enter overview mode, drag a window around but do
not snap it. The phantom window should show on left/right side of the
screen.
- Rotate the device to portrait mode
- Drag the window around again. The phantom window should show on the
top/bottom side of the screen. But instead it still shows on left/right
side of the screen.

Bug: 725683
Change-Id: I3f4710648c5c8f988b8561af3fd6f46d62c6e429
Reviewed-on: https://chromium-review.googlesource.com/726273Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510126}