Support for different weight-functions for time-slicing.

chrome/browser/ui/webui/ntp/suggestions_source_top_sites.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_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
 #pragma once
 
 #include <deque>
 
 #include "chrome/browser/cancelable_request.h"
 #include "chrome/browser/history/history_types.h"
+#include "chrome/browser/history/visit_filter.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_source.h"
 
 class SuggestionsCombiner;
 class Profile;
 
 namespace base {
 class DictionaryValue;
 }
 
 // A SuggestionsSource that uses the local TopSites database to provide
 // suggestions.
 class SuggestionsSourceTopSites : public SuggestionsSource {
  public:
   SuggestionsSourceTopSites();
   virtual ~SuggestionsSourceTopSites();
 
  protected:
   // SuggestionsSource overrides:
   virtual int GetWeight() OVERRIDE;
   virtual int GetItemCount() OVERRIDE;
   virtual base::DictionaryValue* PopItem() OVERRIDE;
   virtual void FetchItems(Profile* profile) OVERRIDE;
   virtual void SetCombiner(SuggestionsCombiner* combiner) OVERRIDE;
 
   void OnSuggestionsURLsAvailable(
       CancelableRequestProvider::Handle handle,
       const history::FilteredURLList& data);
 
  private:
+
+  // Gets the sorting order from the command-line arguments. Defaults to
+  // |ORDER_BY_RECENCY| if there are no command-line argument specifying a
+  // sorting order.
+  static history::VisitFilter::SortingOrder GetSortingOrder();
+
+  // Gets the filter width from the command-line arguments. Defaults to one
+  // hour if there are no command-line argument setting the filter width.
+  static base::TimeDelta GetFilterWidth();
+
   // Our combiner.
   SuggestionsCombiner* combiner_;
 
   // Keep the results of the db query here.
   std::deque<base::DictionaryValue*> items_;
 
   CancelableRequestConsumer history_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(SuggestionsSourceTopSites);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_