Add WindowPinType property on arua::Window

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index de3ac38f969274531808a3cbb822f406c27cf62d..ae18860c3d113d9699d9175dc57925b890c8d5f1 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -719,6 +719,14 @@ bool Widget::IsFullscreen() const {
   return native_widget_->IsFullscreen();
 }
 
+void Widget::Pin(bool trusted) {
+  native_widget_->Pin(trusted);
+}
+
+bool Widget::IsPinned() const {
+  return native_widget_->IsPinned();
+}
+
 void Widget::SetOpacity(float opacity) {
   DCHECK(opacity >= 0.0f);
   DCHECK(opacity <= 1.0f);