Read the selected text explicitly when focusing a texdt field

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview ChromeVox utilities for the automation extension API.
  */
 
 goog.provide('AutomationUtil');
 
@@ skipping 279 matching lines @@
 
   while (root &&
       root.parent &&
       root.parent.root &&
       root.parent.root.role != RoleType.desktop) {
     root = root.parent.root;
   }
   return root;
 };
 
+/**
+ * @param {!AutomationNode} prevNode
+ * @param {!AutomationNode} node
+ * @return {AutomationNode}
+ */
+AutomationUtil.getLeastCommonAncestor = function(prevNode, node) {
+  if (prevNode == node)
+    return node;
+
+  var prevAncestors = AutomationUtil.getAncestors(prevNode);
+  var ancestors = AutomationUtil.getAncestors(node);
+  var divergence = AutomationUtil.getDivergence(prevAncestors, ancestors);
+  return ancestors[divergence - 1];
+};
+
 });  // goog.scope