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This adds web-platform-tests for Network Error Logging.  They should be
suitable to upstream into the cross-platform WPT repo.

Bug: 748549
Change-Id: I24098aeec8488c34a5f9239309264e9534dca6e4
Reviewed-on: https://chromium-review.googlesource.com/1106518Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Douglas Creager <dcreager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584093}