Adding knobs on HQP provider.

components/omnibox/omnibox_field_trial.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 COMPONENTS_OMNIBOX_OMNIBOX_FIELD_TRIAL_H_
 #define COMPONENTS_OMNIBOX_OMNIBOX_FIELD_TRIAL_H_
 
 #include <map>
 #include <string>
 #include <vector>
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   // Returns true if the search provider should not be caching results.
   static bool DisableResultsCaching();
 
   // Returns how the search provider should poll Suggest. Currently, we support
   // measuring polling delay from the last keystroke or last suggest request.
   static void GetSuggestPollingStrategy(bool* from_last_keystroke,
                                         int* polling_delay_ms);
 
   // ---------------------------------------------------------
+  // For HQP scoring related experiments to control the topicality and scoring
+  // ranges of relevancy scores.
+
+  // Returns true if HQP experimental scoring is enabled. Returns false if
+  // |kHQPExperimentalScoringEnabledParam| is not specified in the field trial.
+  static bool HQPExperimentalScoringEnabled();
+
+  // Returns the scoring buckets for HQP experiments. Returns empty string
+  // in case |kHQPExperimentalScoringBucketsParam| or
+  // |kHQPExperimentalScoringEnabledParam| is not specified in the
+  // field trial. Scoring buckets are stored in string form giving mapping from
+  // (topicality_score, frequency_score) to final relevance score.
+  // Please see GetRelevancyScore() under
+  // chrome/browser/history::ScoredHistoryMatch for details.
+  static std::string HQPExperimentalScoringBuckets();
+
+  // Returns the topicality threshold for HQP experiments. Returns -1 if
+  // |kHQPExperimentalScoringTopicalityThresholdParam| or
+  // |kHQPExperimentalScoringEnabledParam| is not specified in the field trial.
+  static float HQPExperimentalTopicalityThreshold();
+
+  // ---------------------------------------------------------
   // Exposed publicly for the sake of unittests.
   static const char kBundledExperimentFieldTrialName[];
   // Rule names used by the bundled experiment.
   static const char kDisableProvidersRule[];
   static const char kShortcutsScoringMaxRelevanceRule[];
   static const char kSearchHistoryRule[];
   static const char kDemoteByTypeRule[];
   static const char kHQPBookmarkValueRule[];
   static const char kHQPDiscountFrecencyWhenFewVisitsRule[];
   static const char kHQPAllowMatchInTLDRule[];
   static const char kHQPAllowMatchInSchemeRule[];
   static const char kZeroSuggestRule[];
   static const char kZeroSuggestVariantRule[];
   static const char kAnswersInSuggestRule[];
   static const char kDisplayHintTextWhenPossibleRule[];
   static const char kDisableResultsCachingRule[];
   static const char kMeasureSuggestPollingDelayFromLastKeystrokeRule[];
   static const char kSuggestPollingDelayMsRule[];
 
   // Parameter names used by the HUP new scoring experiments.
   static const char kHUPNewScoringEnabledParam[];
   static const char kHUPNewScoringTypedCountRelevanceCapParam[];
   static const char kHUPNewScoringTypedCountHalfLifeTimeParam[];
   static const char kHUPNewScoringTypedCountScoreBucketsParam[];
   static const char kHUPNewScoringVisitedCountRelevanceCapParam[];
   static const char kHUPNewScoringVisitedCountHalfLifeTimeParam[];
   static const char kHUPNewScoringVisitedCountScoreBucketsParam[];
 
+  // Parameter names used by the HQP experimental scoring experiments.
+  static const char kHQPExperimentalScoringEnabledParam[];
+  static const char kHQPExperimentalScoringBucketsParam[];
+  static const char kHQPExperimentalScoringTopicalityThresholdParam[];
+
   // The amount of time to wait before sending a new suggest request after the
   // previous one unless overridden by a field trial parameter.
   // Non-const because some unittests modify this value.
   static int kDefaultMinimumTimeBetweenSuggestQueriesMs;
 
  private:
   friend class OmniboxFieldTrialTest;
 
   // The bundled omnibox experiment comes with a set of parameters
   // (key-value pairs).  Each key indicates a certain rule that applies in
@@ skipping 11 matching lines @@
   // prioritize different wildcard contexts, see the implementation.  How to
   // interpret the value is left to the caller; this is rule-dependent.
   static std::string GetValueForRuleInContext(
       const std::string& rule,
       metrics::OmniboxEventProto::PageClassification page_classification);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(OmniboxFieldTrial);
 };
 
 #endif  // COMPONENTS_OMNIBOX_OMNIBOX_FIELD_TRIAL_H_