Fix reset and focus issues in OOBE

chrome/renderer/resources/extensions/automation_custom_bindings.js

Index: chrome/renderer/resources/extensions/automation_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/automation_custom_bindings.js b/chrome/renderer/resources/extensions/automation_custom_bindings.js
index 6071abf7cec66c50e48bd34ea5225033a15c1ed5..350f2179df2d8a1e1e814ffdaa5f60cb9d8b18ec 100644
--- a/chrome/renderer/resources/extensions/automation_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/automation_custom_bindings.js
@@ -212,7 +212,7 @@ automationInternal.onChildTreeID.addListener(function(treeID,
     return;
 
   var subroot = AutomationRootNode.get(childTreeID);
-  if (!subroot) {
+  if (!subroot || subroot.role == schema.EventType.unknown) {
     automationUtil.storeTreeCallback(childTreeID, function(root) {
       // Return early if the root has already been attached.
       if (root.parent)