Mus Demo: Demonstrate external window mode

services/ui/demo/mus_demo.h

 // 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.
 
 #ifndef SERVICES_UI_DEMO_MUS_DEMO_H_
 #define SERVICES_UI_DEMO_MUS_DEMO_H_
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "services/service_manager/public/cpp/service.h"
+#include "services/ui/public/interfaces/window_tree_host.mojom.h"
 #include "ui/aura/mus/window_manager_delegate.h"
 #include "ui/aura/mus/window_tree_client_delegate.h"
 #include "ui/display/screen_base.h"
 
 namespace aura {
 class Env;
 class PropertyConverter;
 
 namespace client {
 class DefaultCaptureClient;
@@ skipping 22 matching lines @@
   ~MusDemo() override;
 
  protected:
   virtual void OnStartImpl() = 0;
 
   class WindowTreeData {
    public:
     explicit WindowTreeData(
         std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
         int square_size);
+    explicit WindowTreeData(mojom::WindowTreeHostFactory* factory,
+                            mojom::WindowTreeClientPtr tree_client,
+                            int square_size);
     ~WindowTreeData();
 
-   private:
     // Initializes the window tree host and start drawing frames.
     void Init(std::unique_ptr<aura::WindowTreeHostMus> window_tree_host);
 
+   private:
     // Draws one frame, incrementing the rotation angle.
     void DrawFrame();
 
     // Helper function to retrieve the window to which we draw the bitmap.
     aura::Window* bitmap_window();
 
     // The Window tree host corresponding to this data.
     std::unique_ptr<aura::WindowTreeHostMus> window_tree_host_;
 
+    // When the WindowTreeData is created with WindowTreeHostFactory, this holds
+    // the Mojo pointer to the window tree host.
+    mojom::WindowTreeHostPtr host_;
+
     // Destroys itself when the window gets destroyed.
     aura_extra::ImageWindowDelegate* window_delegate_ = nullptr;
 
     // Timer for calling DrawFrame().
     base::RepeatingTimer timer_;
 
     // Current rotation angle for drawing.
     double angle_ = 0.0;
 
     // Size in pixels of the square to draw.
@@ skipping 28 matching lines @@
   std::unique_ptr<::wm::WMState> wm_state_;
   std::unique_ptr<aura::PropertyConverter> property_converter_;
 
   DISALLOW_COPY_AND_ASSIGN(MusDemo);
 };
 
 }  // namespace demo
 }  // namespace aura
 
 #endif  // SERVICES_UI_DEMO_MUS_DEMO_H_