Support dragging a virtual file out of the browser.

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 35459)
+++ chrome/browser/views/tab_contents/tab_contents_view_win.h	(working copy)
@@ -13,6 +13,7 @@
 
 class RenderViewContextMenuWin;
 class SadTabView;
+class TabContentsDragWin;
 struct WebDropData;
 class WebDragSource;
 class WebDropTarget;
@@ -62,6 +63,10 @@
   // WidgetWin overridde.
   virtual views::FocusManager* GetFocusManager();
 
+  void EndDragging();
+
+  WebDropTarget* drop_target() const { return drop_target_.get(); }
+
  private:
   // A helper method for closing the tab.
   void CloseTab();
@@ -118,11 +123,6 @@
   // accessible when unparented.
   views::FocusManager* focus_manager_;
 
-  // |drag_source_| is our callback interface passed to the system when we
-  // want to initiate a drag and drop operation.  We use it to tell if a
-  // drag operation is happening.
-  scoped_refptr<WebDragSource> drag_source_;
-
   // Set to true if we want to close the tab after the system drag operation
   // has finished.
   bool close_tab_after_drag_ends_;
@@ -130,6 +130,9 @@
   // Used to close the tab after the stack has unwound.
   base::OneShotTimer<TabContentsViewWin> close_tab_timer_;
 
+  // Used to handle the drag-and-drop.
+  scoped_refptr<TabContentsDragWin> drag_handler_;
+
   DISALLOW_COPY_AND_ASSIGN(TabContentsViewWin);
 };