Propagates window type properties during aura-mus window creation

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 8287c8e4898c1f837e1ffd75a7199d098bc154e2..c8f531067939a55931df652384db49b8459c9e43 100644
--- a/ui/aura/client/aura_constants.cc
+++ b/ui/aura/client/aura_constants.cc
@@ -7,6 +7,8 @@
 #include "ui/aura/window_property.h"
 #include "ui/gfx/geometry/rect.h"
 
+DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT,
+                                      aura::client::WindowTypeProperty*);
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, bool)
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, base::string16*)
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, ui::ModalType)
@@ -51,6 +53,7 @@ DEFINE_OWNED_WINDOW_PROPERTY_KEY(base::string16, kTitleKey, nullptr);
 DEFINE_WINDOW_PROPERTY_KEY(int, kTopViewInset, 0);
 DEFINE_WINDOW_PROPERTY_KEY(SkColor, kTopViewColor, SK_ColorTRANSPARENT);
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(gfx::ImageSkia, kWindowIconKey, nullptr);
+DEFINE_OWNED_WINDOW_PROPERTY_KEY(WindowTypeProperty, kWindowTypeKey, nullptr);
 
 }  // namespace client
 }  // namespace aura