It is time.

ui/views/drag_utils.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/drag_utils.h"
-
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/screen.h"
-#include "ui/gfx/size.h"
-#include "ui/views/widget/widget.h"
-
-namespace {
-
-float GetDeviceScaleForNativeView(views::Widget* widget) {
-  float device_scale = 1.0f;
-  // The following code should work on other platforms as well. But we do not
-  // yet care about device scale factor on other platforms. So to keep drag and
-  // drop behavior on other platforms un-touched, we wrap this in the #if guard.
-  if (widget && widget->GetNativeView()) {
-    gfx::NativeView view = widget->GetNativeView();
-    gfx::Display display = gfx::Screen::GetScreenFor(view)->
-        GetDisplayNearestWindow(view);
-    device_scale = display.device_scale_factor();
-  }
-  return device_scale;
-}
-
-}  // namespace
-
-namespace views {
-
-gfx::Canvas* GetCanvasForDragImage(views::Widget* widget,
-                                   const gfx::Size& canvas_size) {
-  float device_scale = GetDeviceScaleForNativeView(widget);
-  return new gfx::Canvas(canvas_size, device_scale, false);
-}
-
-}  // namespace views