Add COOP plumbing for JavaScript navigation

source

@@ -82052,10 +82052,17 @@ interface <dfn>Location</dfn> { // but see also <a href="#the-location-interface
        a <code>javascript:</code> URL request</span> given <var>resource</var>, the <span>source
        browsing context</span>, and <var>browsingContext</var>.</p></li>
 
+       <li><p>Let <var>finalSandboxFlags</var> be the union of <var>browsingContext</var>'s
+       <span>sandboxing flag set</span> and <var>response</var>'s <span>forced sandboxing flag
+       set</span>.</p></li>
+
        <li><p>Run <span>process a navigate response</span> with <var>resource</var>,
        <var>response</var>, <var>navigationType</var>, the <span>source browsing context</span>,
-       <var>browsingContext</var>, <var>sandboxFlags</var>, <var>incumbentNavigationOrigin</var>,
-       <var>activeDocumentNavigationOrigin</var>, and null.</p></li>
+       <var>browsingContext</var>, <var>finalSandboxFlags</var>,
+       <var>activeDocumentNavigationOrigin</var>, <var>incumbentNavigationOrigin</var>,
+       <var>activeDocumentNavigationOrigin</var>, null, <var>browsingContext</var>'s <span>active
+       document</span>'s <span data-x="concept-document-coop"> cross-origin opener
+       policy</span>, and false.</p></li>
       </ol>
 
       <p class="example">So for example a <span data-x="javascript