A11y: Add/refactor methods for manipulating bitfields on AXNodeData.

ui/views/accessibility/ax_window_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_window_obj_wrapper.h"
 
 #include <stddef.h>
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
@@ skipping 35 matching lines @@
   Widget* widget = Widget::GetWidgetForNativeView(window_);
   if (widget && widget->IsVisible())
     out_children->push_back(AXAuraObjCache::GetInstance()->GetOrCreate(widget));
 }
 
 void AXWindowObjWrapper::Serialize(ui::AXNodeData* out_node_data) {
   out_node_data->id = GetID();
   out_node_data->role = is_alert_ ? ui::AX_ROLE_ALERT : ui::AX_ROLE_WINDOW;
   out_node_data->AddStringAttribute(ui::AX_ATTR_NAME,
                                     base::UTF16ToUTF8(window_->GetTitle()));
-  out_node_data->state = 0;
+  out_node_data->ClearBitfields();
   out_node_data->location = gfx::RectF(window_->GetBoundsInScreen());
 
   ui::AXTreeIDRegistry::AXTreeID child_ax_tree_id =
       window_->GetProperty(ui::kChildAXTreeID);
   if (child_ax_tree_id != ui::AXTreeIDRegistry::kNoAXTreeID) {
     // Most often, child AX trees are parented to Views. We need to handle
     // the case where they're not here, but we don't want the same AX tree
     // to be a child of two different parents.
     //
     // To avoid this double-parenting, only add the child tree ID of this
@@ skipping 45 matching lines @@
 void AXWindowObjWrapper::OnWindowPropertyChanged(aura::Window* window,
                                                  const void* key,
                                                  intptr_t old) {
   if (window == window_ && key == ui::kChildAXTreeID) {
     AXAuraObjCache::GetInstance()->FireEvent(this,
                                              ui::AX_EVENT_CHILDREN_CHANGED);
   }
 }
 
 }  // namespace views