GitLab

Adjust menu controller to ensure correct number of kSelection events.
These are turned into focus events under MSAA.

- Regular menu items: we were firing extra events even when selection
  didn't change.
- Hot button menu items, such as zoom-related, cut/copy/paste in edit
  menu, were not firing any events on hover, because the button already
  considered itself hot tracked via the button controller's mouse
  handling.

AX-Relnotes: avoid missing or duplicate menu item announcements when using mouse
Bug: 1077755, 1106916
Change-Id: Ie933146b647d56f7665cfc72bb708e9f7bdd71de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350483
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797288}