test: check the origin of the blob URLs

In the getter of the origin in URL, the URL that has blob protocol
will be parsed in a function called "originFor".
Add test cases into the url-tests-additional fixture to test that.

Refs: web-platform-tests/wpt#4941

test/fixtures/url-tests.js

@@ -5622,5 +5622,33 @@ module.exports =
     "input": "non-special://[:80/",
     "base": "about:blank",
     "failure": true
+  },
+  {
+    "input": "blob:https://example.com:443/",
+    "base": "about:blank",
+    "href": "blob:https://example.com:443/",
+    "protocol": "blob:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "https://example.com:443/",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "blob:d3958f5c-0777-0845-9dcf-2cb28783acaf",
+    "base": "about:blank",
+    "href": "blob:d3958f5c-0777-0845-9dcf-2cb28783acaf",
+    "protocol": "blob:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "d3958f5c-0777-0845-9dcf-2cb28783acaf",
+    "search": "",
+    "hash": ""
   }
 ]