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This creates an empty directory to be used to write the liburlpattern
code.  This library will be the URL pattern matching engine for the
URLPattern web API being developed in:

  https://github.com/wicg/urlpattern

The pattern syntax is based on the populat path-to-regexp library:

  https://github.com/pillarjs/path-to-regexp

This is being developed as a separate library so that it can be a
derivitive work of path-to-regexp using an MIT license.  No code from
path-to-regexp will be directly included here.

Bug: 1141510
Change-Id: Ia695bf927c40723b3d5adc171fd2b8d3bb879772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486388Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821791}