Enable display rotation, magnifier in unified desktop mode

ash/host/ash_window_tree_host_unified.h

 // Copyright 2015 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_HOST_ASH_WINDOW_TREE_HOST_UNIFIED_H_
 #define ASH_HOST_ASH_WINDOW_TREE_HOST_UNIFIED_H_
 
 #include <vector>
 
 #include "ash/host/ash_window_tree_host.h"
+#include "ash/host/transformer_helper.h"
 #include "ui/aura/window_observer.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/event_source.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace ui {
 class Reflector;
 }
 
 namespace ash {
@@ skipping 22 matching lines @@
   void PrepareForShutdown() override;
   void RegisterMirroringHost(AshWindowTreeHost* mirroring_ash_host) override;
 
   // aura::WindowTreeHost:
   ui::EventSource* GetEventSource() override;
   gfx::AcceleratedWidget GetAcceleratedWidget() override;
   void Show() override;
   void Hide() override;
   gfx::Rect GetBounds() const override;
   void SetBounds(const gfx::Rect& bounds) override;
+  gfx::Transform GetRootTransform() const override;
+  void SetRootTransform(const gfx::Transform& transform) override;
+  gfx::Transform GetInverseRootTransform() const override;
+  void UpdateRootWindowSize(const gfx::Size& host_size) override;
   void SetCapture() override;
   void ReleaseCapture() override;
   gfx::Point GetLocationOnNativeScreen() const override;
   void SetCursorNative(gfx::NativeCursor cursor) override;
   void MoveCursorToNative(const gfx::Point& location) override;
   void OnCursorVisibilityChangedNative(bool show) override;
 
   // aura::WindowObserver:
   void OnWindowDestroying(aura::Window* window) override;
 
   // ui::EventSource:
   ui::EventProcessor* GetEventProcessor() override;
 
   std::vector<AshWindowTreeHost*> mirroring_hosts_;
 
   gfx::Rect bounds_;
 
+  TransformerHelper transformer_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(AshWindowTreeHostUnified);
 };
 
 }  // namespace ash
 
 #endif  // ASH_HOST_ASH_WINDOW_TREE_HOST_UNIFIED_H_