Add WindowPinType property on arua::Window

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 4904f00c228f44d1686a8e7a59ee0e275e82fe82..bbb6981434fcf43c9f8c7145824df2303f110bab 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -632,6 +632,23 @@ bool NativeWidgetAura::IsFullscreen() const {
       ui::SHOW_STATE_FULLSCREEN;
 }
 
+void NativeWidgetAura::Pin(bool trusted) {
+  aura::client::WindowPinType type =
+      trusted ? aura::client::WindowPinType::TRUSTED_PINNED
+              : aura::client::WindowPinType::PINNED;
+  if (!window_ || window_->GetProperty(aura::client::kWindowPinTypeKey) == type)
+    return;  // Nothing to do.
+
+  window_->SetProperty(aura::client::kWindowPinTypeKey, type);
+}
+
+bool NativeWidgetAura::IsPinned() const {
+  aura::client::WindowPinType type =
+      window_->GetProperty(aura::client::kWindowPinTypeKey);
+  return type == aura::client::WindowPinType::PINNED ||
+         type == aura::client::WindowPinType::TRUSTED_PINNED;
+}
+
 void NativeWidgetAura::SetOpacity(float opacity) {
   if (window_)
     window_->layer()->SetOpacity(opacity);