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Adds support for new Contextual Search Resolve-request parameters
to provide translation hints from the client.  The server uses these
params as additional hints from the Chrome Language Model for the
user's preferred language and the language of the selection and
page content.

This means the returned Search Term may be translated or be accompanied
by a Translation Card.

The parameters we send in the Resolve request are the same parameters
we currently send to force a translation one-box in the Search request:
"&tlitesl=" for source language and "&tlitetl=" for the target language.

BUG=952401

Change-Id: Ia79d8c0cf3706009c2b6213895ad8f6df543c24c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032058
Commit-Queue: Donn Denman <donnd@chromium.org>
Auto-Submit: Donn Denman <donnd@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737387}