Support for different weight-functions for time-slicing.

chrome/browser/history/visit_database.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_HISTORY_VISIT_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_VISIT_DATABASE_H_
 #pragma once
 
 #include "chrome/browser/history/history_types.h"
 
@@ skipping 80 matching lines @@
 
   // Fills all visits in the given time range into the given vector that should
   // be user-visible, which excludes things like redirects and subframes. The
   // begin time is inclusive, the end time is exclusive. Either time can be
   // is_null(), in which case the times in that direction are unbounded.
   //
   // Up to |max_count| visits will be returned. If there are more visits than
   // that, the most recent |max_count| will be returned. If 0, all visits in the
   // range will be computed.
   //
-  // Only one visit for each URL will be returned, and it will be the most
-  // recent one in the time range.
+  // If |unique| is set, only one visit for each URL will be returned, and it
+  // will be the most recent one in the time range.
   void GetVisibleVisitsInRange(base::Time begin_time, base::Time end_time,
                                int max_count,
-                               VisitVector* visits);
+                               VisitVector* visits,
+                               bool unique);
 
   // Fills all visits in the given time ranges into the given vector that should
   // be user-visible, which excludes things like redirects and subframes. The
   // begin time is inclusive, the end time is exclusive.
   //
   // Up to |max_count| visits will be returned. If there are more visits than
   // that, the most recent |max_count| will be returned. If 0, all visits in the
   // range will be computed.
-  //
-  // Only one visit for each URL will be returned, and it will be the most
-  // recent one in the time range.
   void GetVisibleVisitsDuringTimes(const VisitFilter& time_filter,
                                    int max_count,
                                    VisitVector* visits);
 
   // Returns the visit ID for the most recent visit of the given URL ID, or 0
   // if there is no visit for the URL.
   //
   // If non-NULL, the given visit row will be filled with the information of
   // the found visit. When no visit is found, the row will be unchanged.
   VisitID GetMostRecentVisitForURL(URLID url_id,
@@ skipping 72 matching lines @@
   bool MigrateVisitsWithoutDuration();
 
  private:
 
   DISALLOW_COPY_AND_ASSIGN(VisitDatabase);
 };
 
 }  // history
 
 #endif  // CHROME_BROWSER_HISTORY_VISIT_DATABASE_H_