Add WindowPinType property on arua::Window

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index 84d781ebb85f153902bd10e9971e73ac068f0c8a..32a8780e711f32129216240151a5bcfdff196a4e 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -841,6 +841,15 @@ bool DesktopNativeWidgetAura::IsFullscreen() const {
   return content_window_ && desktop_window_tree_host_->IsFullscreen();
 }
 
+void DesktopNativeWidgetAura::Pin(bool trusted) {
+  if (content_window_)
+    desktop_window_tree_host_->Pin(trusted);
+}
+
+bool DesktopNativeWidgetAura::IsPinned() const {
+  return content_window_ && desktop_window_tree_host_->IsPinned();
+}
+
 void DesktopNativeWidgetAura::SetOpacity(float opacity) {
   if (content_window_)
     desktop_window_tree_host_->SetOpacity(opacity);