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In WebAuthn, we want the in-session auth dialog to be the child of
window that initiated the WebAuthn request. To do this, we register
the source window with a request_id. The request_id is passed all
the way through DBus. When the in-session auth dialog receives
the request_id, it validates that there's a corresponding
window and uses that window as the parent.

Bug: b/156258540
Cq-Depend: chromium:2487542
Change-Id: If0eab5a261a5423f74b3bad1718353184333cd69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488360Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823435}