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Over time we have to introduce new parameters for Register/
RegisterWithCertificate requests, and this list is growing
unmanageable. We need to add one more parameter, so this CL
just groups such parameters into a single struct with reasonable
values for defaults.

Change-Id: I362ffda59f0b78cc25541953f8afb3e2df11b1c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625124
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666297}