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This patch is similar in spirit to the Android equivalent in
https://chromium-review.googlesource.com/c/chromium/src/+/1930796.

The overall idea is that, if encryption keys are missing, the UI needs
to display this state as an error, and the user should be able to go
through a reauth flow to retrieve the keys.

The actual logic to trigger the key retrieval process is deferred to
future patches and reflected in TODOs.

Bug: 1019685
Change-Id: Iad250aaca3519b7af50c0d8bfc038009a7d0f30d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937368
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720906}