Show ancestor hierarchy in accessibility panel

third_party/WebKit/Source/devtools/front_end/accessibility/AXTreePane.js

Index: third_party/WebKit/Source/devtools/front_end/accessibility/AXTreePane.js
diff --git a/third_party/WebKit/Source/devtools/front_end/accessibility/AXTreePane.js b/third_party/WebKit/Source/devtools/front_end/accessibility/AXTreePane.js
new file mode 100644
index 0000000000000000000000000000000000000000..9e8a6d371487482bdcecf13fb0c4d5d02c97a031
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/front_end/accessibility/AXTreePane.js
@@ -0,0 +1,131 @@
+// Copyright 2016 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.
+
+/**
+ * @constructor
+ * @extends {WebInspector.AccessibilitySubPane}
+ */
+WebInspector.AXTreePane = function()
+{
+    WebInspector.AccessibilitySubPane.call(this, WebInspector.UIString("Accessibility Tree"));
+
+    this._treeOutline = this.createTreeOutline();
+
+    this.element.classList.add("accessibility-computed");
+};
+
+
+WebInspector.AXTreePane.prototype = {
+    /**
+     * @param {!Array<!AccessibilityAgent.AXNode>} nodes
+     */
+    setAXNodeAndAncestors: function(nodes)
+    {
+        this._nodes = nodes;
+
+        var target = this.node().target();
+        var treeOutline = this._treeOutline;
+        treeOutline.removeChildren();
+        treeOutline.element.classList.remove("hidden");
+        var previous = treeOutline.rootElement();
+        while (nodes.length) {
+            var ancestor = nodes.pop();
+            var ancestorTreeElement = new WebInspector.AXNodeTreeElement(ancestor, target);
+            previous.appendChild(ancestorTreeElement);
+            previous.expand();
+            previous = ancestorTreeElement;
+        }
+        previous.selectable = true;
+        previous.select(true /* omitFocus */);
+    },
+
+    __proto__: WebInspector.AccessibilitySubPane.prototype
+};
+
+/**
+ * @constructor
+ * @extends {TreeElement}
+ * @param {!AccessibilityAgent.AXNode} axNode
+ * @param {!WebInspector.Target} target
+ */
+WebInspector.AXNodeTreeElement = function(axNode, target)
+{
+    /** @type {!AccessibilityAgent.AXNode} */
+    this._axNode = axNode;
+
+    /** @type {!WebInspector.Target} */
+    this._target = target;
+
+    // Pass an empty title, the title gets made later in onattach.
+    TreeElement.call(this, "");
+
+    this.selectable = false;
+};
+
+/** @type {!Object<string, string>} */
+WebInspector.AXNodeTreeElement.RoleStyles = {
+    internalRole: "ax-internal-role",
+    role: "ax-role",
+};
+
+WebInspector.AXNodeTreeElement.prototype = {
+    /**
+     * @override
+     */
+    onattach: function()
+    {
+        this._update();
+    },
+
+    _update: function()
+    {
+        this.listItemElement.removeChildren();
+
+        if (this._axNode.ignored) {
+            this._appendIgnoredNodeElement();
+        } else {
+            this._appendRoleElement(this._axNode.role);
+            if ("name" in this._axNode && this._axNode.name.value) {
+                this.listItemElement.createChild("span", "separator").textContent = "\u00A0";
+                this._appendNameElement(/** @type {string} */ (this._axNode.name.value));
+            }
+        }
+    },
+
+    /**
+     * @param {string} name
+     */
+    _appendNameElement: function(name)
+    {
+        var nameElement = createElement("span");
+        nameElement.textContent = '"' + name + '"';
+        nameElement.classList.add("ax-readable-string");
+        this.listItemElement.appendChild(nameElement);
+    },
+
+    /**
+     * @param {!AccessibilityAgent.AXValue=} role
+     */
+    _appendRoleElement: function(role)
+    {
+        if (!role)
+            return;
+
+        var roleElement = createElementWithClass("span", "monospace");
+        roleElement.classList.add(WebInspector.AXNodeTreeElement.RoleStyles[role.type]);
+        roleElement.setTextContentTruncatedIfNeeded(role.value || "");
+
+        this.listItemElement.appendChild(roleElement);
+    },
+
+    _appendIgnoredNodeElement: function()
+    {
+        var ignoredNodeElement = createElementWithClass("span", "monospace");
+        ignoredNodeElement.textContent = WebInspector.UIString("Ignored");
+        ignoredNodeElement.classList.add("ax-tree-ignored-node");
+        this.listItemElement.appendChild(ignoredNodeElement);
+    },
+
+    __proto__: TreeElement.prototype
+};