Implement automatic load of composed/embedded automation trees

chrome/test/data/extensions/api_test/automation/tests/desktop/load_tabs.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.
+
+function getAllWebViews() {
+  function findAllWebViews(node, nodes) {
+    if (node.role == chrome.automation.RoleType.webView)
+      nodes.push(node);
+
+    var children = node.children();
+    for (var i = 0; i < children.length; i++) {
+      var child = findAllWebViews(children[i], nodes);
+    }
+  }
+
+  var webViews = [];
+  findAllWebViews(rootNode, webViews);
+  return webViews;
+};
+
+var allTests = [
+  function testLoadTabs() {
+    var webViews = getAllWebViews();
+    assertEq(2, webViews.length);
+
+    // Test spins up more quickly than the load; listen for the childrenChanged
+    // event.
+    webViews[1].addEventListener(chrome.automation.EventType.childrenChanged,
+        function(evt) {
+          var subroot = webViews[1].firstChild();
+          assertEq(evt.target, subroot.parent());
+
+          var button = subroot.firstChild().firstChild();
+          assertEq(chrome.automation.RoleType.button, button.role);
+
+          var input = subroot.firstChild().lastChild().previousSibling();
+          assertEq(chrome.automation.RoleType.textField, input.role);
+          chrome.test.succeed();
+    }, true);
+  },
+
+  function testSubevents() {
+    var button = null;
+    var webViews = getAllWebViews();
+    var subroot = webViews[1].firstChild();
+
+    rootNode.addEventListener(chrome.automation.EventType.focus,
+        function(evt) {
+          assertEq(button, evt.target);
+          chrome.test.succeed();
+        },
+        false);
+
+    button = subroot.firstChild().firstChild();
+    button.focus();
+  }
+];
+
+setupAndRunTests(allTests,
+                 '<button>alpha</button><input type="text">hello</input>');