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Pipes a boolean through Contextual Search to a server request parameter
to determine whether to make the Resolve an "exact resolve" request that
cannot expand the selection. Uses TemplateUrl to add the parameter
to the Resolve request.

This additional parameter is needed for the Long-press triggering
experiment.

Also includes cleanup of initializers in C++ ContextualSearchContext.

BUG=956277

Change-Id: Iaa0e1988035ed49d13e7a9e77e20c0c2ef04b4d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995842
Commit-Queue: Theresa  <twellington@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Auto-Submit: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736584}