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This allows upper layers (UI) to know whether user action is needed and
provides a way to inject trusted vault encryption keys once they are
available.

Bug: 1010189
Change-Id: Ic5eb9f0c8e525f30ad0401b65a7a5c7d42cd9a7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840097
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702822}