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This is a reland of feab4f74

Original change's description:
> cros: Add alternate keys for interacting with window cycler (alt+tab).
> 
> 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}

Bug: 1067327
Change-Id: Ie05f898abe3565fca603b70450bf3a6d92a9caf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368467Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800641}