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

ui/gfx/screen_ios.mm

-// 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/gfx/screen.h"
-
-#import <UIKit/UIKit.h>
-
-#include "base/logging.h"
-#include "ui/gfx/display.h"
-
-namespace {
-
-class ScreenIos : public gfx::Screen {
-  gfx::Point GetCursorScreenPoint() override {
-    NOTIMPLEMENTED();
-    return gfx::Point(0, 0);
-  }
-
-  bool IsWindowUnderCursor(gfx::NativeWindow window) override {
-    NOTIMPLEMENTED();
-    return false;
-  }
-
-  gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
-    NOTIMPLEMENTED();
-    return gfx::NativeWindow();
-  }
-
-  int GetNumDisplays() const override {
-#if TARGET_IPHONE_SIMULATOR
-    // UIScreen does not reliably return correct results on the simulator.
-    return 1;
-#else
-    return [[UIScreen screens] count];
-#endif
-  }
-
-  std::vector<gfx::Display> GetAllDisplays() const override {
-    NOTIMPLEMENTED();
-    return std::vector<gfx::Display>(1, GetPrimaryDisplay());
-  }
-
-  // Returns the display nearest the specified window.
-  gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override {
-    NOTIMPLEMENTED();
-    return gfx::Display();
-  }
-
-  // Returns the the display nearest the specified point.
-  gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override {
-    NOTIMPLEMENTED();
-    return gfx::Display();
-  }
-
-  // Returns the display that most closely intersects the provided bounds.
-  gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override {
-    NOTIMPLEMENTED();
-    return gfx::Display();
-  }
-
-  // Returns the primary display.
-  gfx::Display GetPrimaryDisplay() const override {
-    UIScreen* mainScreen = [UIScreen mainScreen];
-    CHECK(mainScreen);
-    gfx::Display display(0, gfx::Rect(mainScreen.bounds));
-    display.set_device_scale_factor([mainScreen scale]);
-    return display;
-  }
-
-  void AddObserver(gfx::DisplayObserver* observer) override {
-    // no display change on iOS.
-  }
-
-  void RemoveObserver(gfx::DisplayObserver* observer) override {
-    // no display change on iOS.
-  }
-};
-
-}  // namespace
-
-namespace gfx {
-
-Screen* CreateNativeScreen() {
-  return new ScreenIos;
-}
-
-}  // namespace gfx