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On Win, ARIA switches are equivalent to toggle buttons.
We need to expose both the pressed and checked states instead of only checked.
This fixes NVDA's announcement of the toggling of switches to on, whilst minimally affecting Jaws.
Jaws now reads "<switch name> on pressed" instead of "<switche name> on".
R=aleventhal@chromium.org, suproteem@chromium.org
Bug: 844021
Tested: manually with Jaws and NVDA, browser tests


Change-Id: I9ce4936002bf1a3cf0b99c73a73385c0a32ff3fc
Reviewed-on: https://chromium-review.googlesource.com/1101849
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569937}