Bug 1700421 [wpt PR 28192] - URLPattern: Allow a second argument to test()/exec(...

Bug 1700421 [wpt PR 28192] - URLPattern: Allow a second argument to test()/exec() for baseURL., a=testonly

Automatic update from web-platform-tests
URLPattern: Allow a second argument to test()/exec() for baseURL.

This CL adds support for code to pass a secondary argument to test()
and exec() to act as a baseURL.  For example:

  pattern.test('./index.html', self.location);

To support this the webidl was restructured to have separate method
overloads for USVString and URLPatternInit inputs.  In addition, the
internal implementation was refactored to account for the fact that
a union type is no longer used for the input.

Finally, there was one open question about what to reflect in the
`input` property on the URLPatternResult returned from exec().  This
property contains the input passed to exec().  In the past this was
always a single value, but now there are two values.  This CL deals
with the situation by populating `result.input` with the fully resolved
URL when a baseURL is present.  This is a bit inconsistent with the
value when populated in other cases, but seems less weird than trying
to use an array or secondary property.

Bug: 1141510
Change-Id: Ia247f59b1541ca254ba7d1d871f64d65a7b0b7e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2779364
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#865794}

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wpt-commits: 0d7dd845ec0c0482cbd8c11bddafe9878dc32522
wpt-pr: 28192