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) {

[aboxhall, 2014/04/28 19:50:38]

We don't need to do anything with widget here?

[David Tseng, 2014/04/29 01:35:03]

No. Widget destruction is observed via the other method here.

Moving forward, we might want to send notifications to the extension process,,
but that's not clear as of this cl. The view removed will be sent when the next
notification comes through.

+  AXAuraObjCache::GetInstance()->Remove(view);
+}
+
+}  // namespace views