[Athena] Simple pull to refresh implementation

content/public/browser/web_contents_delegate.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_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 145 matching lines @@
                                   bool motion) {}
 
   // Request the delegate to change the zoom level of the current tab.
   virtual void ContentsZoomChange(bool zoom_in) {}
 
   // Called to determine if the WebContents can be overscrolled with touch/wheel
   // gestures.
   virtual bool CanOverscrollContent() const;
 
   // Callback that allows vertical overscroll activies to be communicated to the
-  // delegate.
+  // delegate. |delta_y| is the total amount of overscroll.
   virtual void OverscrollUpdate(int delta_y) {}
 
+  // Invoked when a vertical overscroll completes.
+  virtual void OverscrollComplete() {}
+
   // Return the rect where to display the resize corner, if any, otherwise
   // an empty rect.
   virtual gfx::Rect GetRootWindowResizerRect() const;
 
   // Invoked prior to showing before unload handler confirmation dialog.
   virtual void WillRunBeforeUnloadConfirm() {}
 
   // Returns true if javascript dialogs and unload alerts are suppressed.
   // Default is false.
   virtual bool ShouldSuppressDialogs();
@@ skipping 312 matching lines @@
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_