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This is due to an incorrect heuristic for showing keyboard menu hints
from menu_runner_impl.cc which checks if the button is currently
focused.

Added a new run type based on whether or not the event that triggered
the app menu is a key event.

Bug: 928678
Change-Id: I6df9159e9a63dedcfa5115fa9ddbfcbd86759d46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1516777
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641712}