New smart passsword bubble algorithm.

chrome/browser/ui/passwords/password_bubble_experiment.h

 // Copyright 2014 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_PASSWORDS_PASSWORD_BUBBLE_EXPERIMENT_H_
 #define CHROME_BROWSER_UI_PASSWORDS_PASSWORD_BUBBLE_EXPERIMENT_H_
 
 #include "base/macros.h"
 #include "components/password_manager/core/browser/password_manager_metrics_util.h"
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 class PrefService;
 
 // These functions handle the algorithms according to which the "Save password?"
-// bubble is shown to user.
+// bubble shows "No thanks" or "Never for this site" button default.
 namespace password_bubble_experiment {
 
 void RegisterPrefs(user_prefs::PrefRegistrySyncable* registry);
 
-// The decision is made based on the "PasswordBubbleAlgorithm" finch experiment.
-// The default value is true.
+// Returns true if "Never for this site" should be the default negative option.
+// Otherwise it's "No thanks". The default value is false.
 // It should be called before showing the "Save Password?" dialog.
-bool ShouldShowBubble(PrefService* prefs);
+bool ShouldShowNeverForThisSiteDefault(PrefService* prefs);
 
 // Should be called when user dismisses the "Save Password?" dialog. It stores
 // the statistics about interactions with the bubble.
 void RecordBubbleClosed(
     PrefService* prefs,
     password_manager::metrics_util::UIDismissalReason reason);
 
 // The name of the finch experiment controlling the algorithm.
 extern const char kExperimentName[];
 
-// The group name for the time based algorithm.
-extern const char kGroupTimeSpanBased[];
-
-// The group name for the probability algorithm.
-extern const char kGroupProbabilityBased[];
-
-// For "Probability" group. The additional "Saves" to be added to the model.
-extern const char kParamProbabilityFakeSaves[];
-
-// For "Probability" group. The interaction history length.
-extern const char kParamProbabilityInteractionsCount[];
-
-// For "TimeSpan" group. The time span until the nope counter is zeroed.
-extern const char kParamTimeSpan[];
-
-// For "TimeSpan" group. The nopes threshold.
-extern const char kParamTimeSpanNopeThreshold[];
+// The name of the finch parameter. It signifies the consecutive nopes
+// threshold after which the user sees "Never for this site" button by default.
+extern const char kParamNopeThreshold[];
 
 }  // namespace password_bubble_experiment
 
 #endif  // CHROME_BROWSER_UI_PASSWORDS_PASSWORD_BUBBLE_EXPERIMENT_H_