Gets the drop arrow to show when dragging URLs over the tab strip....

chrome/browser/views/tabs/tab_strip.h

 // Copyright (c) 2006-2008 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_TABS_TAB_STRIP_H_
 #define CHROME_BROWSER_VIEWS_TABS_TAB_STRIP_H_
 
 #include "base/gfx/point.h"
 #include "base/message_loop.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/views/tabs/tab.h"
 #include "chrome/browser/views/tabs/tab_strip_wrapper.h"
 #include "views/controls/button/image_button.h"
 #include "views/view.h"
-#if defined(OS_WIN)
-#include "views/widget/widget_win.h"
-#endif
 
 class DraggedTabController;
 class ScopedMouseCloseWidthCalculator;
 class TabStripModel;
 
 namespace views {
 class ImageView;
+#if defined(OS_LINUX)
+class WidgetGtk;
+#elif defined(OS_WIN)
+class WidgetWin;
+#endif
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // TabStrip
 //
 //  A View that represents the TabStripModel. The TabStrip has the
 //  following responsibilities:
 //    - It implements the TabStripModelObserver interface, and acts as a
 //      container for Tabs, and is also responsible for creating them.
@@ skipping 328 matching lines @@
 
     // Direction the arrow should point in. If true, the arrow is displayed
     // above the tab and points down. If false, the arrow is displayed beneath
     // the tab and points up.
     bool point_down;
 
     // Renders the drop indicator.
     // TODO(beng): should be views::Widget.
 #if defined(OS_WIN)
     views::WidgetWin* arrow_window;
+#else
+    views::WidgetGtk* arrow_window;
 #endif
     views::ImageView* arrow_view;
 
    private:
     DISALLOW_COPY_AND_ASSIGN(DropInfo);
   };
 
   // Valid for the lifetime of a drag over us.
   scoped_ptr<DropInfo> drop_info_;
 
   // The controller for a drag initiated from a Tab. Valid for the lifetime of
   // the drag session.
   scoped_ptr<DraggedTabController> drag_controller_;
 
   // The Tabs we contain, and their last generated "good" bounds.
   struct TabData {
     Tab* tab;
     gfx::Rect ideal_bounds;
   };
   std::vector<TabData> tab_data_;
 
   // The currently running animation.
   scoped_ptr<TabAnimation> active_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStrip);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_TABS_TAB_STRIP_H_