Fix focus navigation for nested slot case

third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js

 function removeWhiteSpaceOnlyTextNodes(node)
 {
   for (var i = 0; i < node.childNodes.length; i++) {
     var child = node.childNodes[i];
     if (child.nodeType === Node.TEXT_NODE && child.nodeValue.trim().length == 0) {
       node.removeChild(child);
       i--;
     } else if (child.nodeType === Node.ELEMENT_NODE || child.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
       removeWhiteSpaceOnlyTextNodes(child);
     }
   }
   if (node.shadowRoot) {
     removeWhiteSpaceOnlyTextNodes(node.shadowRoot);
   }
 }
 
 function convertTemplatesToShadowRootsWithin(node) {
     var nodes = node.querySelectorAll("template");
     for (var i = 0; i < nodes.length; ++i) {
         var template = nodes[i];
         var mode = template.getAttribute("data-mode");
+        var delegatesFocus = template.hasAttribute("data-delegatesFocus");
         var parent = template.parentNode;
         parent.removeChild(template);
         var shadowRoot;
         if (!mode || mode == 'v0'){
             shadowRoot = parent.createShadowRoot();
         } else {
-            shadowRoot = parent.attachShadow({'mode': mode});
+            shadowRoot = parent.attachShadow({'mode': mode,
+                                              'delegatesFocus': delegatesFocus});
         }
         var expose = template.getAttribute("data-expose-as");
         if (expose)
             window[expose] = shadowRoot;
         if (template.id)
             shadowRoot.id = template.id;
         var fragments = document.importNode(template.content, true);
         shadowRoot.appendChild(fragments);
 
         convertTemplatesToShadowRootsWithin(shadowRoot);
@@ skipping 151 matching lines @@
     assert_equals(actual[i][2], expected[i][2], 'relatedTarget at ' + i + ' should be same');
     assert_array_equals(actual[i][3], expected[i][3], 'composedPath at ' + i + ' should be same');
   }
 }
 
 function assert_background_color(path, color)
 {
   assert_equals(window.getComputedStyle(getNodeInComposedTree(path)).backgroundColor, color,
                 'backgroundColor for ' + path + ' should be ' + color);
 }