Implement actions for Automation API.

chrome/test/data/extensions/api_test/automation/sanity_check/test.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 assertEq = chrome.test.assertEq;
 var assertTrue = chrome.test.assertTrue;
 
 // Do not test orientation or hover attributes (similar to exclusions on native
 // accessibility), since they can be inconsistent depending on the environment.
 var RemoveUntestedStates = function(state) {
@@ skipping 76 matching lines @@
                                function listener(message, sender) {
           if (!sender.tab)
             return;
           assertEq(tab.id, sender.tab.id);
           assertTrue(message['loaded']);
           chrome.automation.getTree(makeAssertions);
           chrome.runtime.onMessage.removeListener(listener);
         });
       });
     });
+  },
+  function testSimpleAction() {
+    function makeAssertions(tree) {
+      var okButton = tree.root.firstChild().firstChild();
+      okButton.addEventListener('focus', function() {
+        chrome.test.succeed();
+      }, true);
+      okButton.focus();
+    }
+    chrome.tabs.create({url: 'test.html'});
+    chrome.automation.getTree(function(tree) {
+      tree.root.addEventListener('load_complete',
+          function() {
+            makeAssertions(tree);
+          }, true);
+    });
   }
 ];
 
 chrome.test.runTests(allTests);