Basic DragImage implementation....

chrome/browser/gtk/notifications/balloon_view_host_gtk.h

 // Copyright (c) 2010 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_NOTIFICATIONS_BALLOON_VIEW_HOST_GTK_H_
 #define CHROME_BROWSER_GTK_NOTIFICATIONS_BALLOON_VIEW_HOST_GTK_H_
 
 #include "app/gfx/native_widget_types.h"
 #include "chrome/browser/gtk/extension_view_gtk.h"
 #include "chrome/browser/notifications/balloon.h"
@@ skipping 61 matching lines @@
   virtual void CreateNewWindow(int route_id);
   virtual void CreateNewWidget(int route_id, bool activatable) {}
   virtual void ShowCreatedWindow(int route_id,
                                  WindowOpenDisposition disposition,
                                  const gfx::Rect& initial_pos,
                                  bool user_gesture);
   virtual void ShowCreatedWidget(int route_id,
                                  const gfx::Rect& initial_pos) {}
   virtual void ShowContextMenu(const ContextMenuParams& params) {}
   virtual void StartDragging(const WebDropData& drop_data,
-                             WebKit::WebDragOperationsMask allowed_ops) {}
+                             WebKit::WebDragOperationsMask allowed_ops,
+                             const SkBitmap& image,
+                             const gfx::Point& image_offset) {}
   virtual void UpdateDragCursor(WebKit::WebDragOperation operation) {}
   virtual void GotFocus() {}
   virtual void TakeFocus(bool reverse) {}
   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                       bool* is_keyboard_shortcut) {
     return false;
   }
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {}
   virtual void HandleMouseEvent() {}
   virtual void HandleMouseLeave() {}
@@ skipping 30 matching lines @@
   // The GTK-specific widget host view.
   RenderWidgetHostViewGtk* render_widget_host_view_;
 
   // Common implementations of some RenderViewHostDelegate::View methods.
   RenderViewHostDelegateViewHelper delegate_view_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(BalloonViewHost);
 };
 
 #endif  // CHROME_BROWSER_GTK_NOTIFICATIONS_BALLOON_VIEW_HOST_GTK_H_