Reland 4e4eae4cbe6136b538a: Make download item drags look like bookmark

ui/views/button_drag_utils.h

 // 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.
 
 #ifndef UI_VIEWS_BUTTON_DRAG_UTILS_H_
 #define UI_VIEWS_BUTTON_DRAG_UTILS_H_
 
 #include "base/strings/string16.h"
 #include "ui/views/views_export.h"
 
@@ skipping 14 matching lines @@
 
 namespace button_drag_utils {
 
 // Sets url and title on data as well as setting a suitable image for dragging.
 // The image looks like that of the bookmark buttons. |press_pt| is optional
 // offset; otherwise, it centers the drag image.
 VIEWS_EXPORT void SetURLAndDragImage(const GURL& url,
                                      const base::string16& title,
                                      const gfx::ImageSkia& icon,
                                      const gfx::Point* press_pt,
-                                     ui::OSExchangeData* data,
-                                     views::Widget* widget);
+                                     const views::Widget& widget,

[Evan Stade, 2017/03/16 00:03:30]

widget isn't allowed to be null and out params are supposed to come at the end.

+                                     ui::OSExchangeData* data);
 
 // As above, but only sets the image.
 VIEWS_EXPORT void SetDragImage(const GURL& url,
                                const base::string16& title,
                                const gfx::ImageSkia& icon,
                                const gfx::Point* press_pt,
-                               ui::OSExchangeData* data,
-                               views::Widget* widget);
+                               const views::Widget& widget,
+                               ui::OSExchangeData* data);
 
 }  // namespace drag_utils
 
 #endif  // UI_VIEWS_BUTTON_DRAG_UTILS_H_