Create RootWindowTransformer after root window's bounds and scale factor are updated.

ash/display/display_controller.cc

 // Copyright (c) 2012 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/display/display_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 
@@ skipping 803 matching lines @@
 
 void DisplayController::OnDisplayBoundsChanged(const gfx::Display& display) {
   if (limiter_)
     limiter_->SetThrottleTimeout(kAfterDisplayChangeThrottleTimeoutMs);
   const internal::DisplayInfo& display_info =
       GetDisplayManager()->GetDisplayInfo(display.id());
   DCHECK(!display_info.bounds_in_pixel().IsEmpty());
 
   UpdateDisplayBoundsForLayout();
   aura::RootWindow* root = root_windows_[display.id()];
+  root->SetHostBounds(display_info.bounds_in_pixel());
   SetDisplayPropertiesOnHostWindow(root, display);
-  root->SetHostBounds(display_info.bounds_in_pixel());
 }
 
 void DisplayController::OnDisplayAdded(const gfx::Display& display) {
   if (limiter_)
     limiter_->SetThrottleTimeout(kAfterDisplayChangeThrottleTimeoutMs);
 
   if (primary_root_window_for_replace_) {
     DCHECK(root_windows_.empty());
     primary_display_id = display.id();
     root_windows_[display.id()] = primary_root_window_for_replace_;
@@ skipping 178 matching lines @@
   for (size_t i = 0; i < root_windows.size(); ++i) {
     std::string name =
         root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
     gfx::AcceleratedWidget xwindow = root_windows[i]->GetAcceleratedWidget();
     XStoreName(ui::GetXDisplay(), xwindow, name.c_str());
   }
 #endif
 }
 
 }  // namespace ash