Add an Android test for the lookalike interstitial

This test sanity checks that we display a lookalike interstitial for a relevant domain name.
The test is adapted from chrome/browser/ssl/CaptivePortalTest.java.

Bug: 936565
Change-Id: Ic92be9630c15ec4d88043411a79edf0a07ed78ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1497767
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638241}
3 files changed