Add WindowPinType property on arua::Window

ui/aura/client/aura_constants.cc

Index: ui/aura/client/aura_constants.cc
diff --git a/ui/aura/client/aura_constants.cc b/ui/aura/client/aura_constants.cc
index 46099a6684be184d3d7518fe9e9850d7d09db43a..19cba1b531f1a22ee8ebb633782b3d0a8acec452 100644
--- a/ui/aura/client/aura_constants.cc
+++ b/ui/aura/client/aura_constants.cc
@@ -23,6 +23,8 @@ DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(AURA_EXPORT, int32_t)
 DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(AURA_EXPORT, int64_t)
 DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(AURA_EXPORT,
                                         aura::client::WindowEmbedType)
+DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(AURA_EXPORT,
+                                        aura::client::WindowPinType)
 
 namespace aura {
 namespace client {
@@ -62,6 +64,9 @@ DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(base::string16, kTitleKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(int, kTopViewInset, 0);
 DEFINE_UI_CLASS_PROPERTY_KEY(SkColor, kTopViewColor, SK_ColorTRANSPARENT);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::ImageSkia, kWindowIconKey, nullptr);
+DEFINE_UI_CLASS_PROPERTY_KEY(WindowPinType,
+                             kWindowPinTypeKey,
+                             WindowPinType::NONE);
 DEFINE_UI_CLASS_PROPERTY_KEY(ui::mojom::WindowType,
                            kWindowTypeKey,
                            ui::mojom::WindowType::UNKNOWN);