Basic DragImage implementation....

chrome/browser/extensions/extension_host.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_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 
 #include "base/perftimer.h"
@@ skipping 123 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_operations);
+                             WebKit::WebDragOperationsMask allowed_operations,
+                             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);
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
   virtual void HandleMouseEvent();
   virtual void HandleMouseLeave();
   virtual void UpdatePreferredSize(const gfx::Size& new_size);
 
@@ skipping 98 matching lines @@
   // are used here, others are not hosted by ExtensionHost.
   ViewType::Type extension_host_type_;
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_