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A new type of token API is introduced to sync password between multiple
ChromeOS devices. On a password change event createToken operation will
invalidate the old token, create and fetch a new one. CrOS devices will
monitor the state of a global token by sending verifyToken requests
and, when local token copy will be identfied as invalid, initiate
online re-auth flow to sync the credentials.

This cl implements basic interactions with the backend service.

Bug: 1090341
Change-Id: I5b2a0d66775e8fd9d5f36eb3c7788241cb76bc1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299352
Commit-Queue: Maciek Slusarczyk <mslus@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795909}