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

chrome/browser/extensions/extension_host.h

 // Copyright (c) 2006-2009 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_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 
 #include "base/scoped_ptr.h"
@@ skipping 95 matching lines @@
                                base::WaitableEvent* modal_dialog_event);
   virtual void CreateNewWidget(int route_id, bool activatable);
   virtual void ShowCreatedWindow(int route_id,
                                  WindowOpenDisposition disposition,
                                  const gfx::Rect& initial_pos,
                                  bool user_gesture,
                                  const GURL& creator_url);
   virtual void ShowCreatedWidget(int route_id,
                                  const gfx::Rect& initial_pos);
   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);
   virtual void HandleMouseEvent();
   virtual void HandleMouseLeave();
   virtual void UpdatePreferredWidth(int pref_width);
 
   // NotificationObserver
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
@@ skipping 48 matching lines @@
   scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
 
   // Only EXTENSION_TOOLSTRIP and EXTENSION_BACKGROUND_PAGE are used here,
   // others are not hostd by ExtensionHost.
   ViewType::Type extension_host_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_