GitLab

This CL adds logic in StandaloneTrustedVaultBackend to support device
registration before vault keys are available; it also allows to follow
very first key rotation, when there are no vault keys locally available,
but device was registered.

Bug: 1094326
Change-Id: If238944a15db550938fc48b9acf3e37bbd7f0e18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624650
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843718}