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According to the following spec radio and menuitemradio should expose
UIA SelectedItem.IsSelected when aria-checked is set :
https://www.w3.org/TR/core-aam-1.1/#mapping_state-property_table

This CL ensures that radio / menuitemradio fire appropriate
SelectionItem events, and whenever a SelectionItem changes its
selection state that we also fire a Property Changed event for
SelectionItem.IsSelected.

AX-Relnotes: Fire missing events for ARIA radio/menuitemradio when aria-checked changes. Narrator will now announce selected state changes for this scenario.
Bug: 1102580
Change-Id: I72f479e25f61b0ddffc28f73d4a9c34e8dc4ecb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212982Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Adam Ettenberger <Adam.Ettenberger@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#791802}