Add setSelection function to automation API.

chrome/renderer/resources/extensions/automation/automation_node.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.
 
 var AutomationEvent = require('automationEvent').AutomationEvent;
 var automationInternal =
     require('binding').Binding.create('automationInternal').generate();
 var IsInteractPermitted =
     requireNative('automationInternal').IsInteractPermitted;
 
@@ skipping 226 matching lines @@
 
   focus: function() {
     this.performAction_('focus');
   },
 
   makeVisible: function() {
     this.performAction_('makeVisible');
   },
 
   setSelection: function(startIndex, endIndex) {
-    this.performAction_('setSelection',
-                        { startIndex: startIndex,
-                          endIndex: endIndex });
+    if (this.role == 'textField' || this.role == 'textBox') {
+      this.performAction_('setSelection',
+                          { focusNodeID: this.id,
+                            anchorOffset: startIndex,
+                            focusOffset: endIndex });
+    }
   },
 
   showContextMenu: function() {
     this.performAction_('showContextMenu');
   },
 
   domQuerySelector: function(selector, callback) {
     automationInternal.querySelector(
       { treeID: this.rootImpl.treeID,
         automationNodeID: this.id,
@@ skipping 615 matching lines @@
 AutomationRootNode.getOrCreate = function(treeID) {
   return AutomationRootNodeImpl.getOrCreate(treeID);
 }
 
 AutomationRootNode.destroy = function(treeID) {
   AutomationRootNodeImpl.destroy(treeID);
 }
 
 exports.AutomationNode = AutomationNode;
 exports.AutomationRootNode = AutomationRootNode;