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ContextualJsonRequest can build and send a Json request to fetch
contextual suggestions.
Contextual suggestions are suggestions based on a given URL.
A unit test verifies that a valid Json request is built.

Bug: n/a
Change-Id: Ic19def03c4080b42117624e9452376abbb68ffa5
Reviewed-on: https://chromium-review.googlesource.com/577540
Commit-Queue: Andre Gaschler <gaschler@chromium.org>
Reviewed-by: Markus Heintz <markusheintz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488223}