Demonstrate external-window-mode in mus-demo

services/ui/display/platform_screen_ozone.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/ui/display/platform_screen_ozone.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 62 matching lines @@
   delegate_ = delegate;
 
   std::unique_ptr<ui::NativeDisplayDelegate> native_display_delegate =
       ui::OzonePlatform::GetInstance()->CreateNativeDisplayDelegate();
 
   // The FakeDisplayController gives us a way to make the NativeDisplayDelegate
   // pretend something display related has happened.
   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
   // flow similar.
   display_configurator_.set_configure_display(true);
   display_configurator_.AddObserver(this);
   display_configurator_.set_state_controller(this);
   display_configurator_.Init(std::move(native_display_delegate), false);
   display_configurator_.ForceInitialConfigure(kChromeOsBootColor);
 }
@@ skipping 283 matching lines @@
   return false;
 }
 
 void PlatformScreenOzone::Create(
     const service_manager::Identity& remote_identity,
     mojom::TestDisplayControllerRequest request) {
   test_bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace display