Add ARIA panel to accessibility sidebar pane

third_party/WebKit/LayoutTests/inspector/elements/accessibility/accessibility-pane-test.js

+var initialize_AccessibilityTest = function() {
+
+var sidebarPane;
+
+InspectorTest.showAccessibilityWidget = function()
+{
+    var sidebarPaneWrappers = WebInspector.panels.elements._elementsSidebarViewWrappers;

[dgozman, 2016/07/22 16:44:29]

These panes are loaded asynchronously. We should wait until all the panes are
loaded in ElementsPanel._loadSidebarViews. 

I suggest to do there:
Promise.all([<all-promises-go-here>]).then(this._sidebarViewsLoadedForTest.bind(this))

And then sniff for _sidebarViewsLoadedForTest method right here. That means
showAccessibilityWidget should take a callback.

+    var sidebarPaneWrapper = sidebarPaneWrappers.find((wrapper) => { return wrapper._title === "Accessibility"; });
+
+    sidebarPaneWrapper.expandPane();
+    sidebarPane = sidebarPaneWrapper.children()[0];
+}
+
+/**
+ * @param {string} idValue
+ * @param {function(!WebInspector.DOMNode)} callback
+ */
+InspectorTest.selectNodeAndWaitForAccessibility = function(idValue, callback)
+{
+    callback = InspectorTest.safeWrap(callback);
+
+    var targetNode;
+
+    InspectorTest.selectNodeWithId(idValue, nodeSelected);
+    InspectorTest.waitForAccessibilityNodeUpdate(callback);
+
+    /**
+     * @param {!WebInspector.DOMNode} node
+     */
+    function nodeSelected(node)
+    {
+        targetNode = node;
+    }
+}
+
+InspectorTest.dumpSelectedElementAccessibilityNode = function()
+{
+    if (!sidebarPane)
+        InspectorTest.showAccessibilityWidget();
+
+    InspectorTest.dumpAccessibilityNode(sidebarPane._axNodeSubPane._axNode);
+}
+
+/**
+ * @param {!AccessibilityAgent.AXNode} accessibilityNode
+ */
+InspectorTest.dumpAccessibilityNode = function(accessibilityNode)
+{
+    if (!accessibilityNode) {
+        InspectorTest.addResult("<null>");
+        return;
+    }
+    var builder = [];
+    builder.push(accessibilityNode.role.value);
+    builder.push('"' + accessibilityNode.name.value + '"');
+
+    for (var property of accessibilityNode.properties)
+        builder.push(property.name + '="' + property.value.value + '"');
+
+    InspectorTest.addResult(builder.join(" "));
+}
+
+/**
+ * @param {!AccessibilitySidebarView} sidebarPane
+ * @param {string} attribute
+ * @return {?WebInspector.ARIAAttributesTreeElement}
+ */
+InspectorTest.findARIAAttributeTreeElement = function(attribute)
+{
+    var ariaSubPane = sidebarPane._ariaSubPane;
+    var treeOutline = ariaSubPane._treeOutline;
+    var childNodes = treeOutline._rootElement._children;
+    for (var treeElement of childNodes) {
+        if (treeElement._attribute.name === attribute)
+            return treeElement;
+    }
+    return null;
+}
+
+/**
+ * @param {function()} callback
+ */
+InspectorTest.waitForAccessibilityNodeUpdate = function(callback)
+{
+    InspectorTest.addSniffer(WebInspector.AccessibilitySidebarView.prototype, "_accessibilityNodeUpdatedForTest", callback);
+}
+};