| // Copyright 2013 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_MOST_VISITED_TILES_EXPERIMENT_H_ |
| #define CHROME_BROWSER_HISTORY_MOST_VISITED_TILES_EXPERIMENT_H_ |
| |
| #include "base/values.h" |
| #include "chrome/browser/history/history_types.h" |
| #include "chrome/common/instant_types.h" |
| |
| namespace history { |
| |
| // This enum is also defined in histograms.xml. These values represent the |
| // types of actions carried out by the Most Visited Tile Placement experiment. |
| enum NtpTileExperimentActions { |
| NTP_TILE_EXPERIMENT_ACTION_REMOVED_URL = 0, |
| NTP_TILE_EXPERIMENT_ACTION_DID_NOT_REMOVE_URL = 1, |
| NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_8 = 2, |
| NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_4 = 3, |
| // The number of Most Visited Tile Placement experiment actions logged. |
| NUM_NTP_TILE_EXPERIMENT_ACTIONS |
| }; |
| |
| // Class for implementing the Most Visited Tile Placement experiment. |
| class MostVisitedTilesExperiment { |
| public: |
| // Helper method to shuffle MostVisited tiles for A/B testing purposes. |
| static void MaybeShuffle(MostVisitedURLList* data); |
| |
| // Returns true if this user is part of the Most Visited Tile Placement |
| // experiment group where URLs currently open in another browser tab are not |
| // displayed on an NTP tile. Note: the experiment targets only the top-level |
| // of sites i.e. if www.foo.com/bar is open in browser, and www.foo.com is a |
| // recommended URL, www.foo.com will still appear on the next NTP open. The |
| // experiment will not remove a URL if doing so would cause the number of Most |
| // Visited recommendations to drop below eight. |
| static bool IsDontShowOpenURLsEnabled(); |
| |
| // Removes URLs already open in browser, for 1993 clients, if part of |
| // experiment described for IsDontShowOpenURLsEnabled(). |
| static void RemoveItemsMatchingOpenTabs( |
| const std::set<std::string>& open_urls, |
| std::vector<InstantMostVisitedItem>* items); |
| |
| // Removes URLs already open in browser, for non-1993 clients, if part of |
| // experiment described for IsDontShowOpenURLsEnabled(). |
| static void RemovePageValuesMatchingOpenTabs( |
| const std::set<std::string>& open_urls, |
| base::ListValue* pages_value); |
| |
| private: |
| // Helper method to log the actions carried out by the Most Visited Tile |
| // Placement experiment. |
| static void LogInHistogram(NtpTileExperimentActions action); |
| |
| // Helper method to determine whether |url| is in |open_urls|. |
| static bool ShouldRemoveURL(const std::set<std::string>& open_urls, |
| const std::string& url, |
| const size_t size); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(MostVisitedTilesExperiment); |
| }; |
| |
| } // namespace history |
| |
| #endif // CHROME_BROWSER_HISTORY_MOST_VISITED_TILES_EXPERIMENT_H_ |