Basic DragImage implementation....

chrome/browser/views/tab_contents/tab_contents_view_gtk.h

Index: chrome/browser/views/tab_contents/tab_contents_view_gtk.h
===================================================================
--- chrome/browser/views/tab_contents/tab_contents_view_gtk.h	(revision 41111)
+++ chrome/browser/views/tab_contents/tab_contents_view_gtk.h	(working copy)
@@ -1,6 +1,6 @@
-// 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.
+// 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_VIEWS_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_
 #define CHROME_BROWSER_VIEWS_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_
@@ -16,8 +16,12 @@
 typedef struct _GtkFloatingContainer GtkFloatingContainer;
 class RenderViewContextMenuGtk;
 class SadTabView;
+class SkBitmap;
 class TabContentsDragSource;
 class WebDragDestGtk;
+namespace gfx {
+class Point;
+}
 namespace views {
 class NativeViewHost;
 }
@@ -61,7 +65,9 @@
   // Backend implementation of RenderViewHostDelegate::View.
   virtual void ShowContextMenu(const ContextMenuParams& params);
   virtual void StartDragging(const WebDropData& drop_data,
-                             WebKit::WebDragOperationsMask ops_allowed);
+                             WebKit::WebDragOperationsMask ops_allowed,
+                             const SkBitmap& image,
+                             const gfx::Point& image_offset);
   virtual void UpdateDragCursor(WebKit::WebDragOperation operation);
   virtual void GotFocus();
   virtual void TakeFocus(bool reverse);