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When no windows are shown, and a user presses tab, focus the
launcher/Home button on the display which has the mouse.

This was based on @newcomer's original CL,
https://crrev.com/c/2128227.

The comments there as well as in the bug have been handled here.

Bug: 1060337
Change-Id: I801b8ecc4e7fefb697cf2ace56736f6e85b3cd43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412518
Commit-Queue: Angus McLean <angusmclean@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812241}