Implement drag and drop of downloads for the Mac downloads page

chrome/browser/download/download_util.h

Index: chrome/browser/download/download_util.h
===================================================================
--- chrome/browser/download/download_util.h	(revision 23544)
+++ chrome/browser/download/download_util.h	(working copy)
@@ -11,6 +11,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/gfx/native_widget_types.h"
 #include "base/task.h"
 
 #if defined(OS_WIN) || defined(TOOLKIT_VIEWS)
@@ -119,12 +120,15 @@
                            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 -----------------------------------------------------