cros: revise to use one shortcut for window movement

changes:
Base CL is: crrev.com/c/738826.
UI review prefer one shortcut for this feature. So we are using
"Search+Alt+m". Instead of allowing user specify moving direction, we
just move window incrementally in sorted display id list and in a cycle
manner.

Bug: 778438
Test: tested on device and test coverage
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I35f946fd26885c0b435c437ef4dc766169989f8f
Reviewed-on: https://chromium-review.googlesource.com/942001


Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Qiang Xu <warx@google.com>
Cr-Commit-Position: refs/heads/master@{#540274}