Mus Demo: Extract code specific to internal mode into a separate class

services/ui/demo/mus_demo_internal.h

Index: services/ui/demo/mus_demo_internal.h
diff --git a/services/ui/demo/mus_demo_internal.h b/services/ui/demo/mus_demo_internal.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c7777469a793c1970c4cb13732fcc38cd402067
--- /dev/null
+++ b/services/ui/demo/mus_demo_internal.h
@@ -0,0 +1,66 @@
+// Copyright 2017 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_INTERNAL_H_
+#define SERVICES_UI_DEMO_MUS_DEMO_INTERNAL_H_
+
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "services/ui/demo/mus_demo.h"
+#include "ui/aura/mus/window_manager_delegate.h"
+
+namespace ui {
+namespace demo {
+
+class MusDemoInternal : public MusDemo, public aura::WindowManagerDelegate {
+ public:
+  MusDemoInternal();
+  ~MusDemoInternal() final;
+
+ private:
+  void OnStartImpl(std::unique_ptr<aura::WindowTreeClient>& window_tree_client,
+                   std::unique_ptr<WindowTreeData>& window_tree_data) final;
+
+  // aura::WindowManagerDelegate:
+  void SetWindowManagerClient(aura::WindowManagerClient* client) final;
+  bool OnWmSetBounds(aura::Window* window, gfx::Rect* bounds) final;
+  bool OnWmSetProperty(aura::Window* window,
+                       const std::string& name,
+                       std::unique_ptr<std::vector<uint8_t>>* new_data) final;
+  void OnWmSetCanFocus(aura::Window* window, bool can_focus) final;
+  aura::Window* OnWmCreateTopLevelWindow(
+      ui::mojom::WindowType window_type,
+      std::map<std::string, std::vector<uint8_t>>* properties) final;
+  void OnWmClientJankinessChanged(const std::set<aura::Window*>& client_windows,
+                                  bool janky) final;
+  void OnWmWillCreateDisplay(const display::Display& display) final;
+  void OnWmNewDisplay(std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
+                      const display::Display& display) final;
+  void OnWmDisplayRemoved(aura::WindowTreeHostMus* window_tree_host) final;
+  void OnWmDisplayModified(const display::Display& display) final;
+  ui::mojom::EventResult OnAccelerator(uint32_t id,
+                                       const ui::Event& event) final;
+  void OnWmPerformMoveLoop(aura::Window* window,
+                           ui::mojom::MoveLoopSource source,
+                           const gfx::Point& cursor_location,
+                           const base::Callback<void(bool)>& on_done) final;
+  void OnWmCancelMoveLoop(aura::Window* window) final;
+  void OnWmSetClientArea(
+      aura::Window* window,
+      const gfx::Insets& insets,
+      const std::vector<gfx::Rect>& additional_client_areas) final;
+  bool IsWindowActive(aura::Window* window) final;
+  void OnWmDeactivateWindow(aura::Window* window) final;
+
+  DISALLOW_COPY_AND_ASSIGN(MusDemoInternal);
+};
+
+}  // namespace demo
+}  // namespace aura
+
+#endif  // SERVICES_UI_DEMO_MUS_DEMO_INTERNAL_H_