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Currently, we send an empty string as a resource loading hint to the
renderer when doing previews resource loading hints optimization.
This CL changes the browser's behavior to send the resource loading
hints that are provided by Previews UI service.

The CL also enables browsertest to modify the list of hints that are
sent to the renderer. This will be used in a browsertest in a subsequent
CL to verify that subresources that match the pattern are not loaded.

Bug: 856243,856247
Change-Id: I29a393dd37090fcb8dc5706669e88e0ae91f47db
Reviewed-on: https://chromium-review.googlesource.com/1136885Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575395}