GitLab

This CL adds a new interstitial with custom strings and makes it
viewable from chrome://interstitials page. It does not yet hook into the
SSL error handler path to trigger the interstitial based on the new net
error.

Bug: 1014711
Change-Id: Ia66567cbb825c35910745aad181006041ae5b537
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913882
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715520}