Chrome OS: Clicking checkbox and radio menu item icons does nothing.

On ChromeOS ToT #503942
(1) Open the shelf/desktop context menu
(2) Hover over the "Shelf position" item.
(3) Attempt to click the center of any radio circle icon.

Ditto for the checkbox icon when the item is checked:
(1) Open the shelf/desktop context menu.
(2) Select the [unchecked] "Autohide shelf" item (to make it checked).
(3) Open the shelf/desktop context menu again.
(4) Attempt to click the center of the checkmark icon.

Expected: Clicking the icon of the menu item executes the menu command.
Actual: Clicking a menu item icon does nothing and the menu stays open.

This doesn't seem to repro on Linux, perhaps we use a system menu?
This probably repros on Windows, but I haven't tested it myself.

I'll take a quick look, I bet it's an easy fix. (set_can_process_events_within_subtree)