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This CL adds a custom menu model for hosted app which has only the items
that should be shown for a hosted app. It also adds 3 new commands which
are currently disabled and will be implemented in a future CL.

Bug: 762401
Change-Id: I7e53eb3d11042f267567e3773784c8594d7c7bee
TBR: erg@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/721226
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513058}