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The fake server leverages the recently used authenticator API,
syncTrustedVaultKeys, that allows the server to provide sync encryption
keys during authentication.

This server-side logic triggers only if the client expressed the desire
to receive sync trusted vault keys, achieved via newly-introduced URL
parameters.

Change-Id: I1538d83fd9716fbdc7989d299911368ba346e39b
Bug: 1081651
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587171Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846255}