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1) getAppWindowInfo to retrieve the list of application windows
   with ids.
2) setAppWindowState to set the window state using the id.
3) closeAppWindow to close the window.

Bug: 1010671
Test: Covered by unit test except for close. It'll be covered in next CL.
Change-Id: Iaa71764a58663713ac5d745b550bfa7b46bb383b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857603
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706965}