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

ui/views/accessibility/ax_view_obj_wrapper.cc

Index: ui/views/accessibility/ax_view_obj_wrapper.cc
diff --git a/ui/views/accessibility/ax_view_obj_wrapper.cc b/ui/views/accessibility/ax_view_obj_wrapper.cc
index 2a22590bbb23c404de53e38a8ce868bad966e4cd..942f25afe1c10eb48f1d1a7c6700cc7e3f7d2321 100644
--- a/ui/views/accessibility/ax_view_obj_wrapper.cc
+++ b/ui/views/accessibility/ax_view_obj_wrapper.cc
@@ -46,15 +46,15 @@ void AXViewObjWrapper::GetChildren(
 }
 
 void AXViewObjWrapper::Serialize(ui::AXNodeData* out_node_data) {
-  out_node_data->state = 0;
+  out_node_data->ClearBitfields();
   view_->GetAccessibleNodeData(out_node_data);
 
   out_node_data->id = GetID();
 
   if (view_->IsAccessibilityFocusable())
-    out_node_data->state |= 1 << ui::AX_STATE_FOCUSABLE;
+    out_node_data->AddState(ui::AX_STATE_FOCUSABLE);
   if (!view_->visible())
-    out_node_data->state |= 1 << ui::AX_STATE_INVISIBLE;
+    out_node_data->AddState(ui::AX_STATE_INVISIBLE);
 
   out_node_data->location = gfx::RectF(view_->GetBoundsInScreen());
 }