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Add a debugging chrome:// URL that loads a page with JavaScript that
just throws some exceptions. This will be used to test the WebUI
JavaScript Error Reporting feature, both manually and in integration
tests.

This page is currently Linux + Chrome OS only. It may be added to
Windows in a future CL if https://crbug.com/1129544 is fixed and
the general WebUI JS Error Reporting feature gets Windows support.

Bug: chromium:1121816

Change-Id: I3d7e29c15d6af9a863b023d900ced5d8c542d12d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473157Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Ian Barkley-Yeung <iby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818036}