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Currently a user can only cycle the window cycle list using alt+tab or
alt+shift+tab. Also, the user can only confirm their selection by
releasing the alt key.

This CL improves the interactivity of window cycler by introducing the
following changes. Pressing the left and right arrows now move the
selection while the window cycler is open. Pressing enter or space
now confirms the selection.

      WindowCycleControllerTest.KeysConfirmSelection

Test: WindowCycleControllerTest.LeftRightCycle,
Bug: 1067327
Change-Id: I03682c5545bf82415b9e71a4814bf5c1b0c196bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358586
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800423}