Always retarget blur events to the root of the focused node

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 15415a91e00f423eb542c708503f5ea4f2e6dc0e..92ef4cb902a3850faf4e1eedca5ef6c11d3904ad 100644
--- a/chrome/renderer/resources/extensions/automation_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/automation_custom_bindings.js
@@ -93,6 +93,14 @@ automationUtil.updateFocusedNode = function() {
   automationUtil.focusedNode = automationUtil.getFocus();
 };
 
+/**
+ * Updates the focus on blur.
+ */
+automationUtil.updateFocusedNodeOnBlur = function() {
+  var focus = automationUtil.getFocus();
+  automationUtil.focusedNode = focus ? focus.root : null;
+};
+
 automation.registerCustomHook(function(bindingsAPI) {
   var apiFunctions = bindingsAPI.apiFunctions;
 
@@ -287,7 +295,7 @@ automationInternal.onAccessibilityEvent.addListener(function(eventParams) {
     // events but otherwise not handle blur events specially.
     var node = privates(targetTree).impl.get(eventParams.targetID);
     if (node == node.root)
-      isFocusEvent = true;
+      automationUtil.updateFocusedNodeOnBlur();
   } else if (eventParams.eventType == schema.EventType.mediaStartedPlaying ||
       eventParams.eventType == schema.EventType.mediaStoppedPlaying) {
     // These events are global to the tree.