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This CL enables the following keyboard shortcuts for hosted
app windows:
 - Shift-Alt-T: Focus window frame toolbar buttons
 - Alt-E and Alt-F: Open app menu
 - F6: Cycle focus between frame buttons and web contents.

Screencast: https://bugs.chromium.org/p/chromium/issues/attachment?aid=330498&signed_aid=BFJfbOWHFSLjA4dEetB3SA==&inline=1

Bug: 822146
Change-Id: Ieb00735dc92c914cb2eb2022bdbd7d72e9c3b603
Reviewed-on: https://chromium-review.googlesource.com/977521
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549834}