Add abstractions that let embedders drive tests of WebContents.

chrome/browser/ui/gtk/tabs/dragged_view_gtk.h

 // Copyright (c) 2012 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_UI_GTK_TABS_DRAGGED_VIEW_GTK_H_
 #define CHROME_BROWSER_UI_GTK_TABS_DRAGGED_VIEW_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/slide_animation.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 class DragData;
-class TabContents;
 class TabRendererGtk;
 
 class DraggedViewGtk : public ui::AnimationDelegate {
  public:
   DraggedViewGtk(DragData* drag_data,
                 const gfx::Point& mouse_tab_offset,
                 const gfx::Size& contents_size);
   virtual ~DraggedViewGtk();
 
   // Moves the attached dragged view to the appropriate location.
@@ skipping 148 matching lines @@
   base::Closure animation_callback_;
 
   // The start and end bounds of the animation sequence.
   gfx::Rect animation_start_bounds_;
   gfx::Rect animation_end_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(DraggedViewGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TABS_DRAGGED_VIEW_GTK_H_