1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_HISTORY_MOST_VISITED_TILES_EXPERIMENT_H_ 6 #define CHROME_BROWSER_HISTORY_MOST_VISITED_TILES_EXPERIMENT_H_ 7 8 #include "base/values.h" 9 #include "chrome/browser/history/history_types.h" 10 #include "chrome/common/instant_types.h" 11 12 namespace history { 13 14 // This enum is also defined in histograms.xml. These values represent the 15 // types of actions carried out by the Most Visited Tile Placement experiment. 16 enum NtpTileExperimentActions { 17 NTP_TILE_EXPERIMENT_ACTION_REMOVED_URL = 0, 18 NTP_TILE_EXPERIMENT_ACTION_DID_NOT_REMOVE_URL = 1, 19 NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_8 = 2, 20 NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_4 = 3, 21 // The number of Most Visited Tile Placement experiment actions logged. 22 NUM_NTP_TILE_EXPERIMENT_ACTIONS 23 }; 24 25 // Class for implementing the Most Visited Tile Placement experiment. 26 class MostVisitedTilesExperiment { 27 public: 28 // Helper method to shuffle MostVisited tiles for A/B testing purposes. 29 static void MaybeShuffle(MostVisitedURLList* data); 30 31 // Returns true if this user is part of the Most Visited Tile Placement 32 // experiment group where URLs currently open in another browser tab are not 33 // displayed on an NTP tile. Note: the experiment targets only the top-level 34 // of sites i.e. if www.foo.com/bar is open in browser, and www.foo.com is a 35 // recommended URL, www.foo.com will still appear on the next NTP open. The 36 // experiment will not remove a URL if doing so would cause the number of Most 37 // Visited recommendations to drop below eight. 38 static bool IsDontShowOpenURLsEnabled(); 39 40 // Removes URLs already open in browser, for 1993 clients, if part of 41 // experiment described for IsDontShowOpenURLsEnabled(). 42 static void RemoveItemsMatchingOpenTabs( 43 const std::set<std::string>& open_urls, 44 std::vector<InstantMostVisitedItem>* items); 45 46 // Removes URLs already open in browser, for non-1993 clients, if part of 47 // experiment described for IsDontShowOpenURLsEnabled(). 48 static void RemovePageValuesMatchingOpenTabs( 49 const std::set<std::string>& open_urls, 50 base::ListValue* pages_value); 51 52 private: 53 // Helper method to log the actions carried out by the Most Visited Tile 54 // Placement experiment. 55 static void LogInHistogram(NtpTileExperimentActions action); 56 57 // Helper method to determine whether |url| is in |open_urls|. 58 static bool ShouldRemoveURL(const std::set<std::string>& open_urls, 59 const std::string& url, 60 const size_t size); 61 62 DISALLOW_IMPLICIT_CONSTRUCTORS(MostVisitedTilesExperiment); 63 }; 64 65 } // namespace history 66 67 #endif // CHROME_BROWSER_HISTORY_MOST_VISITED_TILES_EXPERIMENT_H_ 68
