Plumb the DragOperation through all the layers between the platform DnD code ...

chrome/browser/gtk/tab_contents_drag_source.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.
 
 #ifndef CHROME_BROWSER_GTK_TAB_CONTENTS_DRAG_SOURCE_H_
 #define CHROME_BROWSER_GTK_TAB_CONTENTS_DRAG_SOURCE_H_
 
 #include <gtk/gtk.h>
 
 #include "base/basictypes.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/message_loop.h"
+#include "webkit/api/public/WebDragOperation.h"
 
 class TabContents;
 class TabContentsView;
 struct WebDropData;
 
 // TabContentsDragSource takes care of managing the drag from a TabContents
 // with Gtk.
 class TabContentsDragSource : public MessageLoopForUI::Observer {
  public:
   explicit TabContentsDragSource(TabContentsView* tab_contents_view);
@@ skipping 14 matching lines @@
   static gboolean OnDragFailedThunk(GtkWidget* widget,
                                     GdkDragContext* drag_context,
                                     GtkDragResult result,
                                     TabContentsDragSource* handler) {
     return handler->OnDragFailed();
   }
   gboolean OnDragFailed();
   static void OnDragEndThunk(GtkWidget* widget,
                              GdkDragContext* drag_context,
                              TabContentsDragSource* handler) {
-    handler->OnDragEnd();
+    handler->OnDragEnd(WebKit::WebDragOperationCopy);
+    // TODO(snej): Pass actual operation instead of hardcoding copy
   }
-  void OnDragEnd();
+  void OnDragEnd(WebKit::WebDragOperation operation);
   static void OnDragDataGetThunk(GtkWidget* drag_widget,
                                  GdkDragContext* context,
                                  GtkSelectionData* selection_data,
                                  guint target_type,
                                  guint time,
                                  TabContentsDragSource* handler) {
     handler->OnDragDataGet(context, selection_data, target_type, time);
   }
   void OnDragDataGet(GdkDragContext* context, GtkSelectionData* selection_data,
                      guint target_type, guint time);
@@ skipping 16 matching lines @@
 
   // This is the widget we use to initiate drags. Since we don't use the
   // renderer widget, we can persist drags even when our contents is switched
   // out.
   GtkWidget* drag_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentsDragSource);
 };
 
 #endif  // CHROME_BROWSER_GTK_TAB_CONTENTS_DRAG_SOURCE_H_