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Users on a Captive Portal network without an internet connection may see
an error interstitial or experience timeouts. These metrics will help to
identify users in these scenarios.

Bug: 783315, 785548
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I911b6d9a57a017d2827ee0feeb07d8721acfa849
Reviewed-on: https://chromium-review.googlesource.com/783694
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520748}