mash: improves browser frame decorations

ash/mus/property_util.cc

Index: ash/mus/property_util.cc
diff --git a/ash/mus/property_util.cc b/ash/mus/property_util.cc
index 0ebcc0b98f74ac14c37210e8a32125eca65e966f..40adf4085d0c2b6bc712300ad2312fdab67a0a8a 100644
--- a/ash/mus/property_util.cc
+++ b/ash/mus/property_util.cc
@@ -4,6 +4,8 @@
 
 #include "ash/mus/property_util.h"
 
+#include "ash/public/cpp/window_style.h"
+#include "ash/public/interfaces/window_style.mojom.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/interfaces/window_manager.mojom.h"
 #include "ui/aura/mus/property_converter.h"
@@ -64,6 +66,16 @@ bool ShouldEnableImmersive(const InitProperties& properties) {
   return iter == properties.end() || !mojo::ConvertTo<bool>(iter->second);
 }
 
+mojom::WindowStyle GetWindowStyle(const InitProperties& properties) {
+  auto iter = properties.find(mojom::kAshWindowStyle_InitProperty);
+  if (iter == properties.end())
+    return mojom::WindowStyle::DEFAULT;
+
+  const int32_t value = mojo::ConvertTo<int32_t>(iter->second);
+  return IsValidWindowStyle(value) ? static_cast<mojom::WindowStyle>(value)
+                                   : mojom::WindowStyle::DEFAULT;
+}
+
 void ApplyProperties(
     aura::Window* window,
     aura::PropertyConverter* property_converter,