Append the serialization of URL to inputs when performing a match

The list `inputs` is an array of `URLPatternInput` which can only be either a `USVString` or a `URLPatternInit`. To handle the case where a URL is passed through, we need to append the serialization of that URL.

Author: shannonbooth

spec.bs

@@ -496,7 +496,8 @@ A <dfn>component</dfn> is a [=struct=] with the following [=struct/items=]:
   1. Let |search| be the empty string.
   1. Let |hash| be the empty string.
   1. Let |inputs| be an empty [=list=].
-  1. [=list/Append=] |input| to |inputs|.
+  1. If |input| is a [=/URL=], then [=list/append=] the [=URL serializer|serialization=] of |input| to |inputs|.
+  1. Otherwise, [=list/append=] |input| to |inputs|.
   1. If |input| is a {{URLPatternInit}} then:
     1. If |baseURLString| was given, throw a {{TypeError}}.
     1. Let |applyResult| be the result of [=process a URLPatternInit=] given |input|, "url", |protocol|, |username|, |password|, |hostname|, |port|, |pathname|, |search|, and |hash|. If this throws an exception, catch it, and return null.