Implement actions for Automation API.

chrome/common/extensions/api/automation.idl

 // 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.
 
 // The <code>chrome.automation</code> API allows developers to access the
 // automation (accessibility) tree for the browser. This is a tree
 // representation, analogous to the DOM tree, which represents the
 // <em>semantic</em> structure of a page, and can be used to programmatically
 // interact with a page.
 [nocompile] namespace automation {
@@ skipping 12 matching lines @@
 
     // A collection of this node's other attributes.
     // TODO(aboxhall): Create and use combined list of attributes from
     // AXStringAttribute, AXIntAttribute etc.
     object? attributes;
 
     // The index of this node in its parent node's list of children. If this is
     // the root node, this will be undefined.
     long? index_in_parent;
 
+    // Traversal.
     static object[] children();
     static object parent();
     static object firstChild();
     static object lastChild();
     static object previousSibling();
     static object nextSibling();
+
+    // Actions.
+    static void doDefault();
+    static void focus();
+    static void makeVisible();
+    static void setSelection(long startIndex, long endIndex);
   };
 
   // The automation tree for a single page.
   [nocompile] dictionary AutomationTree {
     AutomationNode root;
   };
 
   // Called when the <code>AutomationTree</code> for the page is available.
   callback RootCallback = void(AutomationTree tree);
 
   interface Functions {
     // Get the automation tree for the current tab, enabling automation if
     // necessary.
     [nocompile] static void getTree(RootCallback callback);
   };
 };