Reland Extend AXTreeSourceViews to support views::Widget and aura::Window.

ui/views/accessibility/ax_aura_obj_wrapper.h

Index: ui/views/accessibility/ax_aura_obj_wrapper.h
diff --git a/ui/views/accessibility/ax_aura_obj_wrapper.h b/ui/views/accessibility/ax_aura_obj_wrapper.h
new file mode 100644
index 0000000000000000000000000000000000000000..551b10786378376526d1189250ae1d69d565e37b
--- /dev/null
+++ b/ui/views/accessibility/ax_aura_obj_wrapper.h
@@ -0,0 +1,36 @@
+// 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_AURA_OBJ_WRAPPER_H_
+#define UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_WRAPPER_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "ui/views/views_export.h"
+
+namespace ui {
+struct AXNodeData;
+}  // namespace ui
+
+namespace views {
+
+// An interface abstraction for Aura views that exposes the view-tree formed
+// by the implementing view types.
+class VIEWS_EXPORT AXAuraObjWrapper {
+ public:
+  virtual ~AXAuraObjWrapper() {}
+
+  virtual AXAuraObjWrapper* GetParent() = 0;
+  virtual void GetChildren(
+      std::vector<AXAuraObjWrapper*>* out_children) = 0;
+  virtual void Serialize(ui::AXNodeData* out_node_data) = 0;
+  virtual int32 GetID() = 0;
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_WRAPPER_H_