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This CL adds high-level device registration logic for trusted vault
together with required interfaces/skeletons.

Device has to be registered in order to silently follow further key
rotations in the future. Device registration means generation of device
key pair and sending public key to the server. Most recent vault key
must be locally available in order to register the device. Currently,
device registration is supported only for active sync account.

Bug: 1102340
Change-Id: If7f6034db56752622bd108598a80c3e19681ba17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339484Reviewed-by: Eric Orth <ericorth@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#798583}