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For cr_dialog to behave modaaly, it's better to stop propagation of
'keydown' events. To support this, introduce consume-keydown-event
to cr_dialog. If this property is true, cr_dialog will consume
keydown events.


Bug: 883221
Change-Id: If2981794cad08dfa6dbca8e08d2d16351fad47bd
Reviewed-on: https://chromium-review.googlesource.com/c/1254001
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597039}