Compare against storage key when creating a shared worker

This is technically not a normative change right now, but it will be when whatwg/storage#144 lands.

source

@@ -105160,23 +105160,51 @@ interface <dfn interface>SharedWorker</dfn> : <span>EventTarget</span> {
    <li><p>Let <var>callerIsSecureContext</var> be true if <var>outside settings</var> is a
    <span>secure context</span>; otherwise, false.</p></li>
 
+   <li><p>Let <var>outside storage key</var> be the result of running <span>obtain a storage key
+   for non-storage purposes</span> given <var>outside settings</var>.</p></li>
+
    <li>
     <p><span>Enqueue the following steps</span> to the <span>shared worker manager</span>:</p>
 
     <ol>
      <li><p>Let <var>worker global scope</var> be null.</p></li>
 
      <li>
-      <p>If there exists a <code>SharedWorkerGlobalScope</code> object whose <span
-      data-x="dom-WorkerGlobalScope-closing">closing</span> flag is false, <span
-      data-x="concept-SharedWorkerGlobalScope-constructor-origin">constructor origin</span> is
-      <span>same origin</span> with <var>outside settings</var>'s <span
-      data-x="concept-settings-object-origin">origin</span>, <span
-      data-x="concept-SharedWorkerGlobalScope-constructor-url">constructor url</span> <span
-      data-x="concept-url-equals">equals</span> <var>urlRecord</var>, and <span
-      data-x="concept-WorkerGlobalScope-name">name</span> equals the value of <var>options</var>'s
-      <code data-x="">name</code> member, then set <var>worker global scope</var> to that
-      <code>SharedWorkerGlobalScope</code> object.</p>
+      <p><span data-x="list iterate">For each</span> <var>scope</var> in the list of all
+      <code>SharedWorkerGlobalScope</code> objects:</p>
+
+      <ol>
+        <li><p>Let <var>worker storage key</var> be the result of running <span>obtain a storage
+        key for non-storage purposes</span> given <var>scope</var>'s <span>relevant settings
+        object</span>.</p></li>
+
+        <li>
+         <p>If all of the following conditions are true:</p>
+
+         <ul class="brief">
+          <li><var>worker storage key</var> <span data-x="storage key equal">equals</span>
+          <var>outside storage key</var>;</li>
+
+          <li><var>scope</var>'s <span data-x="dom-WorkerGlobalScope-closing">closing</span> flag
+          is false;</li>
+
+          <li><var>scope</var>'s <span data-x="concept-SharedWorkerGlobalScope-constructor-url">
+          constructor url</span> <span data-x="concept-url-equals">equals</span>
+          <var>urlRecord</var>; and</li>
+
+          <li><var>scope</var>'s <span data-x="concept-WorkerGlobalScope-name">name</span> equals
+          the value of <var>option</var>'s <code data-x="">name</code> member</li>
+         </ul>
+
+         <p>then:</p>
+
+         <ol>
+          <li><p>Set <var>worker global scope</var> to <var>scope</var>.</p></li>
+
+          <li><p><span>Break</span>.</p></li>
+         </ol>
+        </li>
+      </ol>
 
       <p class="note"><code data-x="data protocol">data:</code> URLs create a worker with an <span
       data-x="concept-origin-opaque">opaque origin</span>. Both the <span