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This enables websites/apps to decide whether to send a user-verification
request without actually starting a dialog.

BUG: b/144861739
Change-Id: Iaa5044aac25229e9a55f3e4b0f67236ffae941a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528635
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828517}