[OLD ATTEMPT, DO NOT REVIEW] mustash: Enable connections to mus from the Chrome renderer

ui/views/mus/native_widget_mus.cc

Index: ui/views/mus/native_widget_mus.cc
diff --git a/ui/views/mus/native_widget_mus.cc b/ui/views/mus/native_widget_mus.cc
index d51516d71be7ae77097d58a99b670b3c67694697..93e1d4bbc16e6a5be858f1268fed6737802af2d8 100644
--- a/ui/views/mus/native_widget_mus.cc
+++ b/ui/views/mus/native_widget_mus.cc
@@ -180,7 +180,10 @@ NativeWidgetMus::NativeWidgetMus(internal::NativeWidgetDelegate* delegate,
       show_state_before_fullscreen_(ui::PLATFORM_WINDOW_STATE_UNKNOWN),
       ownership_(Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET),
       content_(new aura::Window(this)),
-      close_widget_factory_(this) {}
+      close_widget_factory_(this) {
+  // TODO(fsamuel): Figure out lifetime of |window_|.
+  content_->SetNativeWindowProperty("mus", window_);
+}
 
 NativeWidgetMus::~NativeWidgetMus() {
   if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)