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Menu bounds do not fit new wider options if the menu options are added
after the menu is initially drawn, and the width of the new options
exceeds {screen_width - original_menu_origin.x}. This makes wide menu
options unusable in some cases because the menu does not widen to
accommodate the new items.

Regression started: r573978

Test case:
1. Show a website with link[1] on the far right side of the screen:
https://www.google.com/chromebook/
2. Right click to show a menu on one of the links in the toolbar.

The menu should be wide enough to show all contents of the menu.

[1]Step 1 must have a link as the source of the menu because
links use arc::OpenWithMenu, which can add wider ("Open with ...")
options to a context menu. These options are added after the menu
is drawn because we show the menu before arc calls back with the new
menu options.

Test: MenuControllerTest.GrowingMenuMovesLaterallyNotVertically
Bug: 882662
Change-Id: Ic848fdb545bbdd05f874041bf1044adb7bd1d094
Reviewed-on: https://chromium-review.googlesource.com/c/1262397
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600563}