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This CL adds an optional experiment param that controls what positions
of the navigation prediction can be prefetched if they are eligible.
In practice, this will hopefully control the number of prefetches that
occur on searches where the first eligible link is pretty far down the
page.

The param is a CSV instead of a min/max to allow fine-grained control.

Bug: 1141988
Change-Id: I35d581e10c291f6aaca79370c9f8f23aca76e40d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495965Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821340}