Add ShellDelegate, MediaDelegate and KeyboardUI stubs to mus ash

ash/aura/wm_shell_aura.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 "ash/aura/wm_shell_aura.h"
 
+#include <utility>
+
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_delegate.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_activation_observer.h"
 #include "ash/common/wm_display_observer.h"
 #include "ash/display/display_manager.h"
@@ skipping 14 matching lines @@
 #if defined(USE_X11)
 #include "ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h"
 #endif
 
 #if defined(USE_OZONE)
 #include "ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_ozone.h"
 #endif
 
 namespace ash {
 
-WmShellAura::WmShellAura(ShellDelegate* delegate) : WmShell(delegate) {
+WmShellAura::WmShellAura(std::unique_ptr<ShellDelegate> shell_delegate)
+    : WmShell(std::move(shell_delegate)) {
   WmShell::Set(this);
 }
 
 WmShellAura::~WmShellAura() {
   WmShell::Set(nullptr);
 }
 
 void WmShellAura::PrepareForShutdown() {
   if (added_activation_observer_)
     Shell::GetInstance()->activation_client()->RemoveObserver(this);
@@ skipping 177 matching lines @@
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanging());
 }
 
 void WmShellAura::OnDisplayConfigurationChanged() {
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanged());
 }
 
 }  // namespace ash