overscroll: Fix an issue where the overscroll window could get stuck.

content/browser/web_contents/web_contents_view_aura.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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 25 matching lines @@
     : public WebContentsViewPort,
       public RenderViewHostDelegateView,
       NON_EXPORTED_BASE(public OverscrollControllerDelegate),
       public ui::ImplicitAnimationObserver,
       public aura::WindowDelegate,
       public aura::client::DragDropDelegate {
  public:
   WebContentsViewAura(WebContentsImpl* web_contents,
                       WebContentsViewDelegate* delegate);
 
+  void SetupOverlayWindowForTesting();
+
  private:
   class WindowObserver;
 #if defined(OS_WIN)
   class ChildWindowObserver;
 #endif
 
   virtual ~WebContentsViewAura();
 
   void SizeChangedCommon(const gfx::Size& size);
 
@@ skipping 164 matching lines @@
   // This manages the overlay window that shows the screenshot during a history
   // navigation triggered by the overscroll gesture.
   scoped_ptr<OverscrollNavigationOverlay> navigation_overlay_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_