Extend AXTreeSourceViews to handle aura::Window and views::Widget.

ui/views/accessibility/ax_window_obj_wrapper.h

+// 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.
+
+#ifndef UI_VIEWS_ACCESSIBILITY_AX_WINDOW_OBJ_WRAPPER_H_
+#define UI_VIEWS_ACCESSIBILITY_AX_WINDOW_OBJ_WRAPPER_H_
+
+#include "ui/views/accessibility/ax_node_source_obj_wrapper.h"
+
+namespace aura {
+class Window;
+}  // namespace aura
+
+namespace views {
+
+class AXWindowObjWrapper : public AXNodeSourceObjWrapper {
+ public:
+  explicit AXWindowObjWrapper(aura::Window* window) : window_(window) {}
+  virtual ~AXWindowObjWrapper() {}
+
+  virtual AXNodeSourceObjWrapper* GetParent() OVERRIDE;
+  virtual void GetChildren(
+      std::vector<AXNodeSourceObjWrapper*>* out_children) OVERRIDE;
+  virtual void Serialize(ui::AXNodeData* out_node_data) OVERRIDE;
+
+ private:
+  aura::Window* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(AXWindowObjWrapper);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ACCESSIBILITY_AX_WINDOW_OBJ_WRAPPER_H_