Simplify calls for scale factor

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 12 matching lines @@
 #include "base/trace_event/trace_event.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/class_property.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/ime/input_method.h"
+#include "ui/base/layout.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/base/x/x11_util_internal.h"
 #include "ui/base/x/x11_window_event_manager.h"
-#include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/events/devices/x11/device_data_manager_x11.h"
 #include "ui/events/devices/x11/device_list_cache_x11.h"
 #include "ui/events/devices/x11/touch_factory_x11.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/null_event_targeter.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/events/platform/x11/x11_event_source.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/size_conversions.h"
@@ skipping 1761 matching lines @@
 
 void DesktopWindowTreeHostX11::DispatchKeyEvent(ui::KeyEvent* event) {
   if (native_widget_delegate_->AsWidget()->IsActive())
     GetInputMethod()->DispatchKeyEvent(event);
 }
 
 void DesktopWindowTreeHostX11::ConvertEventToDifferentHost(
     ui::LocatedEvent* located_event,
     DesktopWindowTreeHostX11* host) {
   DCHECK_NE(this, host);
-  const display::Display display_src =
-      display::Screen::GetScreen()->GetDisplayNearestWindow(window());
-  const display::Display display_dest =
-      display::Screen::GetScreen()->GetDisplayNearestWindow(host->window());
-  DCHECK_EQ(display_src.device_scale_factor(),
-            display_dest.device_scale_factor());
+  DCHECK_EQ(ui::GetScaleFactorForNativeView(window()),
+            ui::GetScaleFactorForNativeView(host->window()));
   gfx::Vector2d offset =
       GetLocationOnScreenInPixels() - host->GetLocationOnScreenInPixels();
   gfx::PointF location_in_pixel_in_host =
       located_event->location_f() + gfx::Vector2dF(offset);
   located_event->set_location_f(location_in_pixel_in_host);
   located_event->set_root_location_f(location_in_pixel_in_host);
 }
 
 void DesktopWindowTreeHostX11::ResetWindowRegion() {
   // If a custom window shape was supplied then apply it.
@@ skipping 531 matching lines @@
 
 // static
 DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopWindowTreeHostX11(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views