Enable display rotation, magnifier in unified desktop mode

ash/host/ash_window_tree_host_win.cc

 // Copyright 2014 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/host/ash_window_tree_host.h"
 
 #include "ash/ash_export.h"
 #include "ash/ash_switches.h"
 #include "ash/host/ash_remote_window_tree_host_win.h"
 #include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/host/root_window_transformer.h"
 #include "ash/host/transformer_helper.h"
 #include "base/command_line.h"
 #include "base/win/windows_version.h"
 #include "ui/aura/window_tree_host_win.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/transform.h"
 
 namespace ash {
 namespace {
 
 class AshWindowTreeHostWin : public AshWindowTreeHost,
                              public aura::WindowTreeHostWin {
  public:
   explicit AshWindowTreeHostWin(const gfx::Rect& initial_bounds)
       : aura::WindowTreeHostWin(initial_bounds),
         fullscreen_(false),
         saved_window_style_(0),
         saved_window_ex_style_(0),
-        transformer_helper_(this) {}
+        transformer_helper_(this) {
+    transformer_helper_.Init();
+  }
   ~AshWindowTreeHostWin() override {}
 
  private:
   // AshWindowTreeHost:
   void ToggleFullScreen() override {
     gfx::Rect target_rect;
     if (!fullscreen_) {
       fullscreen_ = true;
       saved_window_style_ = GetWindowLong(hwnd(), GWL_STYLE);
       saved_window_ex_style_ = GetWindowLong(hwnd(), GWL_EXSTYLE);
@@ skipping 74 matching lines @@
     const AshWindowTreeHostInitParams& init_params) {
   if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
       !base::CommandLine::ForCurrentProcess()->HasSwitch(
           ash::switches::kForceAshToDesktop))
     return new AshRemoteWindowTreeHostWin(init_params.remote_hwnd);
 
   return new AshWindowTreeHostWin(init_params.initial_bounds);
 }
 
 }  // namespace ash