Move DisplayManager and DisplayChangeObserverX11 from aura to ash.

ui/aura/root_window.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 "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "ui/aura/aura_switches.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/client/event_client.h"
 #include "ui/aura/client/screen_position_client.h"
-#include "ui/aura/display_manager.h"
 #include "ui/aura/env.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_tracker.h"
 #include "ui/base/events/event.h"
 #include "ui/base/gestures/gesture_recognizer.h"
@@ skipping 30 matching lines @@
 typedef std::vector<EventFilter*> EventFilters;
 
 void GetEventFiltersToNotify(Window* target, EventFilters* filters) {
   while (target) {
     if (target->event_filter())
       filters->push_back(target->event_filter());
     target = target->parent();
   }
 }
 
-float GetDeviceScaleFactorFromDisplay(const Window* window) {
-  DisplayManager* display_manager = Env::GetInstance()->display_manager();
-  return display_manager->GetDisplayNearestWindow(window).device_scale_factor();
+float GetDeviceScaleFactorFromDisplay(Window* window) {
+  return gfx::Screen::GetScreenFor(window)->
+      GetDisplayNearestWindow(window).device_scale_factor();
 }
 
 Window* ConsumerToWindow(ui::GestureConsumer* consumer) {
   return consumer && !consumer->ignores_events() ?
       static_cast<Window*>(consumer) : NULL;
 }
 
 void SetLastMouseLocation(const Window* root_window,
                           const gfx::Point& location) {
   Env::GetInstance()->SetLastMouseLocation(*root_window, location);
@@ skipping 955 matching lines @@
   ui::MouseEvent event(ui::ET_MOUSE_MOVED,
                        orig_mouse_location,
                        orig_mouse_location,
                        ui::EF_IS_SYNTHESIZED);
   event.set_system_location(Env::GetInstance()->last_mouse_location());
   OnHostMouseEvent(&event);
 #endif
 }
 
 }  // namespace aura