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Add a basic browser test for WebUI JS Error Reporting. This just tests
the basic functionality for a start.

Bug: chromium:1121816
Change-Id: I8f8ed722da59d362f1ca1ad588698deac733fc4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580231
Commit-Queue: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838268}