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

chrome/browser/tab_contents/tab_contents_view_mac.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_TAB_CONTENTS_TAB_CONTENTS_VIEW_MAC_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
@@ skipping 51 matching lines @@
   virtual void SetInitialFocus();
   virtual void StoreFocus();
   virtual void RestoreFocus();
   virtual RenderWidgetHostView* CreateNewWidgetInternal(int route_id,
                                                         bool activatable);
   virtual void ShowCreatedWidgetInternal(RenderWidgetHostView* widget_host_view,
                                          const gfx::Rect& initial_pos);
 
   // Backend implementation of RenderViewHostDelegate::View.
   virtual void ShowContextMenu(const ContextMenuParams& params);
-  virtual void StartDragging(const WebDropData& drop_data);
-  virtual void UpdateDragCursor(bool is_drop_target);
+  virtual void StartDragging(const WebDropData& drop_data,
+                             WebKit::WebDragOperationsMask allowed_operations);
+  virtual void UpdateDragCursor(WebKit::WebDragOperation operation);
   virtual void GotFocus();
   virtual void TakeFocus(bool reverse);
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
 
   // NotificationObserver implementation ---------------------------------------
 
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
@@ skipping 11 matching lines @@
   // visible.
   scoped_nsobject<SadTabView> sad_tab_;
 
   // The page content's intrinsic width.
   int preferred_width_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentsViewMac);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_MAC_H_