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This CL adds support for the chrome://interstitials WebUI, which
contains links for dummy interstitials.  Currently only a subset of the
available links are implemented for iOS.

Bug: 1064803
Change-Id: Ie8fed45623f18319ff1c8a9de5108108a796b2bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145154
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Auto-Submit: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758619}