Implement actions for Automation API.

chrome/test/data/extensions/api_test/automation/sanity_check/test.js

Index: chrome/test/data/extensions/api_test/automation/sanity_check/test.js
diff --git a/chrome/test/data/extensions/api_test/automation/sanity_check/test.js b/chrome/test/data/extensions/api_test/automation/sanity_check/test.js
index 3cf6d289d6d869d1348e1aad1a2d765e3b093d78..be3eadf045d2789516f2ec1bad019f73947aeee9 100644
--- a/chrome/test/data/extensions/api_test/automation/sanity_check/test.js
+++ b/chrome/test/data/extensions/api_test/automation/sanity_check/test.js
@@ -94,6 +94,22 @@ var allTests = [
         });
       });
     });
+  },
+  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);
+    });
   }
 ];