Move Screen, its impls, DisplayObserver and DisplayChangeNotifier to ui/display

ui/gfx/screen.cc

-// Copyright 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/gfx/screen.h"
-
-#include "ui/gfx/geometry/rect.h"
-
-namespace gfx {
-
-namespace {
-
-Screen* g_screen;
-
-}  // namespace
-
-Screen::Screen() {
-}
-
-Screen::~Screen() {
-}
-
-// static
-Screen* Screen::GetScreen() {
-#if defined(OS_MACOSX) || defined(OS_ANDROID)
-  // TODO(scottmg): https://crbug.com/558054
-  if (!g_screen)
-    g_screen = CreateNativeScreen();
-#endif
-  return g_screen;
-}
-
-// static
-void Screen::SetScreenInstance(Screen* instance) {
-  g_screen = instance;
-}
-
-gfx::Rect Screen::ScreenToDIPRectInWindow(NativeView view,
-                                          const gfx::Rect& screen_rect) const {
-  float scale = GetDisplayNearestWindow(view).device_scale_factor();
-  return ScaleToEnclosingRect(screen_rect, 1.0f / scale);
-}
-
-gfx::Rect Screen::DIPToScreenRectInWindow(NativeView view,
-                                          const gfx::Rect& dip_rect) const {
-  float scale = GetDisplayNearestWindow(view).device_scale_factor();
-  return ScaleToEnclosingRect(dip_rect, scale);
-}
-
-}  // namespace gfx