mustash: Enable connections to mus from the Chrome renderer [take 2]

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..6d7caac4003f664b4594b0972ef5fb263bc1e02e 100644
--- a/ui/views/mus/native_widget_mus.cc
+++ b/ui/views/mus/native_widget_mus.cc
@@ -13,6 +13,7 @@
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/layout_manager.h"
+#include "ui/aura/mus/mus_util.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/compositor/clip_transform_recorder.h"
@@ -180,7 +181,10 @@ 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_|.
+  aura::SetMusWindow(content_, window_);
+}
 
 NativeWidgetMus::~NativeWidgetMus() {
   if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)