Wires up immersive mode for chrome and mash

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 39efee2553a351144f914e7c23eb51530b79f223..13c3359408c9e76c8b77a9f9a771dd8fa1a3ceb2 100644
--- a/ash/mus/property_util.cc
+++ b/ash/mus/property_util.cc
@@ -246,5 +246,12 @@ bool ShouldRemoveStandardFrame(ui::Window* window) {
              ui::mojom::WindowManager::kRemoveStandardFrame_Property);
 }
 
+bool ShouldRenderParentTitleArea(ui::Window* window) {
+  return window->HasSharedProperty(
+             ui::mojom::WindowManager::kRendererParentTitleArea_Property) &&
+         window->GetSharedProperty<bool>(
+             ui::mojom::WindowManager::kRendererParentTitleArea_Property);
+}
+
 }  // namespace mus
 }  // namespace ash