Demonstrate external-window-mode in mus-demo

services/ui/display/platform_screen_ozone.cc

Index: services/ui/display/platform_screen_ozone.cc
diff --git a/services/ui/display/platform_screen_ozone.cc b/services/ui/display/platform_screen_ozone.cc
index 3a9433d18359257a14f0e81140c148a1920dd9c7..1819f725ee1df828c73160b37aea4d8c10e96e22 100644
--- a/services/ui/display/platform_screen_ozone.cc
+++ b/services/ui/display/platform_screen_ozone.cc
@@ -80,6 +80,8 @@ void PlatformScreenOzone::Init(PlatformScreenDelegate* delegate) {
   if (!base::SysInfo::IsRunningOnChromeOS()) {
     fake_display_controller_ =
         native_display_delegate->GetFakeDisplayController();
+    // Don't set up a default display on non-ChromeOS.

[rjkroege, 2016/11/18 22:47:14]

I think that this will break the oxygen build of CrOS mustash. The code in mus
that creates a PlatformScreen needs to configure this appropriately based on
whether or not there is a window manager or not?

+    return;
   }
 
   // We want display configuration to happen even off device to keep the control