First version of the time slicing on the urls. Not ready for review yet.

chrome/browser/history/visitsegment_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_VISITSEGMENT_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_VISITSEGMENT_DATABASE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/history/history_types.h"
@@ skipping 40 matching lines @@
   bool IncreaseSegmentVisitCount(SegmentID segment_id, base::Time ts,
                                  int amount);
 
   // Compute the segment usage since |from_time| using the provided aggregator.
   // A PageUsageData is added in |result| for the highest-scored segments up to
   // |max_result_count|.
   void QuerySegmentUsage(base::Time from_time,
                          int max_result_count,
                          std::vector<PageUsageData*>* result);
 
+  // Compute the segment usage from |from_time| to |to_time| using the provided
+  // aggregator. A PageUsageData is added in |result| for the highest-scored
+  // segments up to |max_result_count|.
+  void QuerySegmentUsageTimeInterval(base::Time from_time,
+                                     base::Time to_time,
+                                     int max_result_count,
+                                     std::vector<PageUsageData*>* result);
+
   // Delete all the segment usage data which is older than the provided time
   // stamp.
   bool DeleteSegmentData(base::Time older_than);
 
   // Change the presentation id for the segment identified by |segment_id|
   bool SetSegmentPresentationIndex(SegmentID segment_id, int index);
 
   // Delete the segment currently using the provided url for representation.
   // This will also delete any associated segment usage data.
   bool DeleteSegmentForURL(URLID url_id);
 
  protected:
   // Returns the database for the functions in this interface.
   virtual sql::Connection& GetDB() = 0;
 
   // Creates the tables used by this class if necessary. Returns true on
   // success.
   bool InitSegmentTables();
 
   // Deletes all the segment tables, returning true on success.
   bool DropSegmentTables();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VisitSegmentDatabase);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_VISITSEGMENT_DATABASE_H_