GTK: first cut at web contents as drag destination....

chrome/browser/tab_contents/tab_contents_view_gtk.h

 // 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.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <vector>
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/gtk/focus_store_gtk.h"
 #include "chrome/browser/tab_contents/tab_contents_view.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "chrome/common/owned_widget_gtk.h"
 
 class BlockedPopupContainerViewGtk;
 class ConstrainedWindowGtk;
 class RenderViewContextMenuGtk;
 class SadTabGtk;
+class WebDragDest;
 typedef struct _GtkFloatingContainer GtkFloatingContainer;
 
 class TabContentsViewGtk : public TabContentsView,
                            public NotificationObserver {
  public:
   // The corresponding TabContents is passed in the constructor, and manages our
   // lifetime. This doesn't need to be the case, but is this way currently
   // because that's what was easiest when they were split.
   explicit TabContentsViewGtk(TabContents* tab_contents);
   virtual ~TabContentsViewGtk();
@@ skipping 100 matching lines @@
 
   // Each individual UI for constrained dialogs currently displayed. The
   // objects in this vector are owned by the TabContents, not the view.
   std::vector<ConstrainedWindowGtk*> constrained_windows_;
 
   // The drop data for the current drag (for drags that originate in the render
   // view).
   scoped_ptr<WebDropData> drop_data_;
   // The mime type for the file contents of the current drag (if any).
   GdkAtom drag_file_mime_type_;
+  // The helper object that handles drag destination related interactions with
+  // GTK.
+  scoped_ptr<WebDragDest> drag_dest_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentsViewGtk);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_