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

ui/views/accessibility/ax_widget_obj_wrapper.h

Index: ui/views/accessibility/ax_widget_obj_wrapper.h
diff --git a/ui/views/accessibility/ax_widget_obj_wrapper.h b/ui/views/accessibility/ax_widget_obj_wrapper.h
new file mode 100644
index 0000000000000000000000000000000000000000..61ff1e90f28757b1bce5ed3d1a30e992a3b98c01
--- /dev/null
+++ b/ui/views/accessibility/ax_widget_obj_wrapper.h
@@ -0,0 +1,44 @@
+// 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_WIDGET_OBJ_WRAPPER_H_
+#define UI_VIEWS_ACCESSIBILITY_AX_WIDGET_OBJ_WRAPPER_H_
+
+#include "ui/views/accessibility/ax_aura_obj_wrapper.h"
+#include "ui/views/widget/widget_observer.h"
+#include "ui/views/widget/widget_removals_observer.h"
+
+namespace views {
+class Widget;
+
+// Describes a |Widget| for use with other AX classes.
+class AXWidgetObjWrapper : public AXAuraObjWrapper,
+                           public WidgetObserver,
+                           public WidgetRemovalsObserver {
+ public:
+  explicit AXWidgetObjWrapper(Widget* widget);
+  virtual ~AXWidgetObjWrapper();
+
+  // AXAuraObjWrapper overrides.
+  virtual AXAuraObjWrapper* GetParent() OVERRIDE;
+  virtual void GetChildren(
+      std::vector<AXAuraObjWrapper*>* out_children) OVERRIDE;
+  virtual void Serialize(ui::AXNodeData* out_node_data) OVERRIDE;
+  virtual int32 GetID() OVERRIDE;
+
+  // WidgetObserver overrides.
+  virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
+
+  // WidgetRemovalsObserver overrides.
+  virtual void OnWillRemoveView(Widget* widget, View* view) OVERRIDE;
+
+ private:
+  Widget* widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(AXWidgetObjWrapper);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ACCESSIBILITY_AX_WIDGET_OBJ_WRAPPER_H_