Extend AXTreeSourceViews to handle aura::Window and views::Widget.

chrome/renderer/resources/extensions/automation_custom_bindings.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.
 
 // Custom bindings for the automation API.
 var automation = require('binding').Binding.create('automation');
 var automationInternal =
     require('binding').Binding.create('automationInternal').generate();
 var eventBindings = require('event_bindings');
 var Event = eventBindings.Event;
@@ skipping 10 matching lines @@
  * Creates an id associated with a particular AutomationTree based upon a
  * renderer/renderer host pair's process and routing id.
  */
 var createAutomationTreeID = function(pid, rid) {
   return pid + '_' + rid;
 };
 
 automation.registerCustomHook(function(bindingsAPI) {
   var apiFunctions = bindingsAPI.apiFunctions;
 
-  // TODO(aboxhall/dtseng): Re-work once 'desktop' object is fully specced
+// TODO(aboxhall, dtseng): Make this return the speced AutomationRootNode obj.

[aboxhall, 2014/04/28 19:50:38]

Nit: align comment with function call below (indent 2 spaces).

[David Tseng, 2014/04/29 01:35:03]

Done.

   apiFunctions.setHandleRequest('getTree', function(callback) {
     // enableCurrentTab() ensures the renderer for the current tab has
     // accessibility enabled, and fetches its process and routing ids to use as
     // a key in the idToAutomationTree map. The callback to enableCurrentTab is
     // bound to the callback passed in to getTree(), so that once the tree is
     // available (either due to having been cached earlier, or after an
     // accessibility event occurs which causes the tree to be populated), the
     // callback can be called.
     automationInternal.enableCurrentTab(function(pid, rid) {
       var id = createAutomationTreeID(pid, rid);
@@ skipping 38 matching lines @@
       for (var i = 0; i < idToCallback[id].length; i++) {
         var callback = idToCallback[id][i];
         callback(targetTree);
       }
       delete idToCallback[id];
     }
   }
 });
 
 exports.binding = automation.generate();