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This CL fixes an issue where the overlay didn't hide the toolbar properly
so it could still be tabbed to, and a corresponding problem where overlay
buttons could be tabbed to when not visible.

Bug: 851835, 851864
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1562211745c2373ee64a85936953137f2541ae48
Reviewed-on: https://chromium-review.googlesource.com/1098420
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566763}