Reland: Add an event to notify accessibility when a permissions bubble gets shown.

chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
index 3e6fe190fc10822c5f1432f83c733bacbed0718c..5b4e23d881825984d55a6aaebf9635173e48b7d6 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
@@ -83,3 +83,13 @@ AutomationPredicate.linebreak = function(first, second) {
   return fl.top != sl.top ||
       (fl.top + fl.height != sl.top + sl.height);
 };
+
+/**
+ * Leaf nodes that should be ignored.
+ * @param {chrome.automation.AutomationNode} node
+ * @return {boolean}
+ */
+AutomationPredicate.shouldIgnoreLeaf = function(node) {
+  return AutomationPredicate.leaf(node) &&
+      node.role == chrome.automation.RoleType.client;
+};