cros: Adds ShellPort functions for simplified display mode

ash/mus/bridge/shell_port_mash.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 ASH_MUS_BRIDGE_SHELL_PORT_MASH_H_
 #define ASH_MUS_BRIDGE_SHELL_PORT_MASH_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 86 matching lines @@
   void AddDisplayObserver(WmDisplayObserver* observer) override;
   void RemoveDisplayObserver(WmDisplayObserver* observer) override;
   void AddPointerWatcher(views::PointerWatcher* watcher,
                          views::PointerWatcherEventTypes events) override;
   void RemovePointerWatcher(views::PointerWatcher* watcher) override;
   bool IsTouchDown() override;
   void ToggleIgnoreExternalKeyboard() override;
   void SetLaserPointerEnabled(bool enabled) override;
   void SetPartialMagnifierEnabled(bool enabled) override;
   void CreatePointerWatcherAdapter() override;
+  std::unique_ptr<AshWindowTreeHost> CreateAshWindowTreeHost(
+      const AshWindowTreeHostInitParams& init_params) override;
   void CreatePrimaryHost() override;
   void InitHosts(const ShellInitParams& init_params) override;
+  std::unique_ptr<display::NativeDisplayDelegate> CreateNativeDisplayDelegate()
+      override;
   std::unique_ptr<AcceleratorController> CreateAcceleratorController() override;
 
  private:
   friend class ShellPortMashTestApi;
 
   struct MashSpecificState {
     MashSpecificState();
     ~MashSpecificState();
 
     views::PointerWatcherEventRouter* pointer_watcher_event_router = nullptr;
@@ skipping 24 matching lines @@
 
   std::unique_ptr<SessionStateDelegate> session_state_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellPortMash);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_SHELL_PORT_MASH_H_