Make pull to refresh not perform regular reload (with cache revalidation)

content/public/browser/navigation_controller.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_NAVIGATION_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 339 matching lines @@
   // Navigates to the specified offset from the "current entry". Does nothing if
   // the offset is out of bounds.
   virtual void GoToOffset(int offset) = 0;
 
   // Reloads the current entry. If |check_for_repost| is true and the current
   // entry has POST data the user is prompted to see if they really want to
   // reload the page. In nearly all cases pass in true.  If a transient entry
   // is showing, initiates a new navigation to its URL.
   virtual void Reload(bool check_for_repost) = 0;
 
+  // Like Reload(), but for refreshing page content and may not need to
+  // validate cache content.
+  // TODO(kinuko): Update the comment once we fix the cache validation
+  // behavior.
+  virtual void ReloadToRefreshContent(bool check_for_repost) = 0;
+
   // Like Reload(), but don't use caches (aka "shift-reload").
   virtual void ReloadIgnoringCache(bool check_for_repost) = 0;
 
   // Reloads the current entry using the original URL used to create it.  This
   // is used for cases where the user wants to refresh a page using a different
   // user agent after following a redirect.
   virtual void ReloadOriginalRequestURL(bool check_for_repost) = 0;
 
   // Like Reload(), but disables Lo-Fi.
   virtual void ReloadDisableLoFi(bool check_for_repost) = 0;
@@ skipping 105 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class NavigationControllerImpl;
   NavigationController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_