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The menus should show mnemonics if Alt is pressed.  This did not work in
Ozone because the platform didn't expose the current status of control
keys (which is delivered with input events as so called modifiers).

This CL introduces a new method that returns the current state of
modifier keys from the platform, and allows the menu mnemonics for two
Ozone platforms.

In addition, one unit tests of the menu controller has been enabled for
all platforms where Aura is available.

Bug: 1085700, 1113086
Change-Id: Ie2857c763d325f85c7f464e69cc22a18bcbf6f61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333833Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#797578}