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

ui/views/accessibility/ax_widget_obj_wrapper.cc

+// 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.
+
+#include "ui/views/accessibility/ax_widget_obj_wrapper.h"
+
+#include "ui/accessibility/ax_node_data.h"
+#include "ui/views/accessibility/ax_aura_obj_cache.h"
+#include "ui/views/accessibility/ax_aura_obj_wrapper.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+
+AXWidgetObjWrapper::AXWidgetObjWrapper(Widget* widget) : widget_(widget) {
+  widget->AddObserver(this);
+  widget->AddRemovalsObserver(this);
+}
+
+AXWidgetObjWrapper::~AXWidgetObjWrapper() {
+  widget_->RemoveObserver(this);
+  widget_->RemoveRemovalsObserver(this);
+  widget_ = NULL;
+}
+
+AXAuraObjWrapper* AXWidgetObjWrapper::GetParent() {
+  return AXAuraObjCache::GetInstance()->GetOrCreate(widget_->GetNativeView());
+}
+
+void AXWidgetObjWrapper::GetChildren(
+    std::vector<AXAuraObjWrapper*>* out_children) {
+  out_children->push_back(
+      AXAuraObjCache::GetInstance()->GetOrCreate(widget_->GetRootView()));
+}
+
+void AXWidgetObjWrapper::Serialize(ui::AXNodeData* out_node_data) {
+  out_node_data->id = GetID();
+  out_node_data->role = ui::AX_ROLE_CLIENT;
+  out_node_data->location = widget_->GetWindowBoundsInScreen();
+  // TODO(dtseng): Set better states.
+  out_node_data->state = 0;
+}
+
+int32 AXWidgetObjWrapper::GetID() {
+  return AXAuraObjCache::GetInstance()->GetID(widget_);
+}
+
+void AXWidgetObjWrapper::OnWidgetDestroying(Widget* widget) {
+  AXAuraObjCache::GetInstance()->Remove(widget);
+}
+
+void AXWidgetObjWrapper::OnWillRemoveView(Widget* widget, View* view) {
+  AXAuraObjCache::GetInstance()->Remove(view);
+}
+
+}  // namespace views