Basic DragImage implementation....

chrome/browser/views/tab_contents/tab_contents_view_win.h

Index: chrome/browser/views/tab_contents/tab_contents_view_win.h
===================================================================
--- chrome/browser/views/tab_contents/tab_contents_view_win.h	(revision 41111)
+++ chrome/browser/views/tab_contents/tab_contents_view_win.h	(working copy)
@@ -13,10 +13,14 @@
 
 class RenderViewContextMenuWin;
 class SadTabView;
+class SkBitmap;
 class TabContentsDragWin;
 struct WebDropData;
 class WebDragSource;
 class WebDropTarget;
+namespace gfx {
+class Point;
+}
 
 // Windows-specific implementation of the TabContentsView. It is a HWND that
 // contains all of the contents of the tab and associated child views.
@@ -55,7 +59,9 @@
   // Backend implementation of RenderViewHostDelegate::View.
   virtual void ShowContextMenu(const ContextMenuParams& params);
   virtual void StartDragging(const WebDropData& drop_data,
-                             WebKit::WebDragOperationsMask operations);
+                             WebKit::WebDragOperationsMask operations,
+                             const SkBitmap& image,
+                             const gfx::Point& image_offset);
   virtual void UpdateDragCursor(WebKit::WebDragOperation operation);
   virtual void GotFocus();
   virtual void TakeFocus(bool reverse);