Implement drag and drop of downloads for the Mac downloads page

chrome/browser/download/download_util.h

 // Copyright (c) 2009 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.
 //
 // Download utilities.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/gfx/native_widget_types.h"
 #include "base/task.h"
 
 #if defined(OS_WIN) || defined(TOOLKIT_VIEWS)
 #include "views/view.h"
 #endif
 
 namespace gfx {
 class Canvas;
 }
 
@@ skipping 88 matching lines @@
 
 void PaintDownloadComplete(gfx::Canvas* canvas,
 #if defined(OS_WIN) || defined(TOOLKIT_VIEWS)
                            views::View* containing_view,
 #endif
                            int origin_x,
                            int origin_y,
                            double animation_progress,
                            PaintDownloadProgressSize size);
 
-#if defined(OS_WIN) || defined(TOOLKIT_VIEWS)
+#if defined(OS_WIN) || defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)
 // Drag support ----------------------------------------------------------------
 
 // Helper function for download views to use when acting as a drag source for a
-// DownloadItem. If 'icon' is NULL, no image will be accompany the drag.
-void DragDownload(const DownloadItem* download, SkBitmap* icon);
+// DownloadItem. If |icon| is NULL, no image will be accompany the drag. |view|
+// is only required for Mac OS X, elsewhere it can be NULL.
+void DragDownload(const DownloadItem* download,
+                  SkBitmap* icon,
+                  gfx::NativeView view);
 #endif
 
 // Executable file support -----------------------------------------------------
 
 // Copy all executable file extensions.
 void InitializeExeTypes(std::set<std::string>* exe_extensions);
 
 }  // namespace download_util
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_