Enable display rotation, magnifier in unified desktop mode

ash/host/ash_window_tree_host_unified.h

Index: ash/host/ash_window_tree_host_unified.h
diff --git a/ash/host/ash_window_tree_host_unified.h b/ash/host/ash_window_tree_host_unified.h
index 024b8dfd446b244f70fc130df10dfe2453626f29..aa9ab4c36b207d333848ef298faa7b7d1c081386 100644
--- a/ash/host/ash_window_tree_host_unified.h
+++ b/ash/host/ash_window_tree_host_unified.h
@@ -8,6 +8,7 @@
 #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"
@@ -50,6 +51,10 @@ class AshWindowTreeHostUnified : public AshWindowTreeHost,
   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;
@@ -67,6 +72,8 @@ class AshWindowTreeHostUnified : public AshWindowTreeHost,
 
   gfx::Rect bounds_;
 
+  TransformerHelper transformer_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(AshWindowTreeHostUnified);
 };