Enable display rotation, magnifier in unified desktop mode

ash/host/ash_window_tree_host_x11.cc

Index: ash/host/ash_window_tree_host_x11.cc
diff --git a/ash/host/ash_window_tree_host_x11.cc b/ash/host/ash_window_tree_host_x11.cc
index c82d9154ba74d53a333bdbf41c4184f817aa8442..9e3cdc0a0108fc22e870ce865f30ded3cbd772ed 100644
--- a/ash/host/ash_window_tree_host_x11.cc
+++ b/ash/host/ash_window_tree_host_x11.cc
@@ -35,6 +35,7 @@ namespace ash {
 
 AshWindowTreeHostX11::AshWindowTreeHostX11(const gfx::Rect& initial_bounds)
     : WindowTreeHostX11(initial_bounds), transformer_helper_(this) {
+  transformer_helper_.Init();
   aura::Env::GetInstance()->AddObserver(this);
 }