Omnibox: Create HistoryQuickProvider new scoring field trial.

chrome/browser/autocomplete/autocomplete_field_trial.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_AUTOCOMPLETE_AUTOCOMPLETE_FIELD_TRIAL_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_FIELD_TRIAL_H_
 #pragma once
 
 #include <string>
 
@@ skipping 33 matching lines @@
 
   // Gets the group name (as a number) to use when sending a suggest query
   // to Google.  Should only be called if InSuggestFieldTrial().
   static int GetSuggestGroupNameAsNumber();
 
   // Gets the maximum number of groups in the suggest field trial.
   // (Useful for telling UMA_HISTOGRAM_ENUMERATION the number of buckets
   // to create.)
   static int GetSuggestNumberOfGroups();
 
+  // ---------------------------------------------------------
+  // For the History Quick Provider new scoring field trial.
+
+  // Returns whether the user is in any field trial group for this
+  // field trial.  False indicates that the field trial wasn't
+  // successfully created for some reason.
+  static bool InHQPNewScoringFieldTrial();

[Ilya Sherman, 2012/06/15 01:24:58]

nit: Is there any more descriptive name that we can give to this, rather than
just "new" scoring?  I'm imagining that you'll want to run additional field
trials tweaking the scoring after this one, and it'll get confusing if they're
all some variant of "new".

[Mark P, 2012/06/15 12:26:12]

I thought about this.  The closest I got is Multiplicative, but I don't think
that explains much more.

If this experiment works, we'll switch over and get rid of the notion of "new".

If it doesn't, you're right; I'm going to have to run experiments like
NewScoringSquashPopularity and such, but having a different, more descriptive
name doesn't make it any easier to run a MoreDescriptiveNameSquashPopularity
experiment.

+
+  // Returns whether the user should get the experiment setup or

[Ilya Sherman, 2012/06/15 01:24:58]

nit: "experiment" -> "experimental"?

[Mark P, 2012/06/15 12:26:12]

Done.

+  // the default setup for this field trial.  The experiment
+  // group uses "new scoring" (a complex multiplicate calculation that,

[Ilya Sherman, 2012/06/15 01:24:58]

nit: Is "multiplicate" a typo or a fancy word I don't know?

[Mark P, 2012/06/15 12:26:12]

Typo.  Fixed.

+  // among other differences from "old scoring", uses word break
+  // information).
+  static bool InHQPNewScoringFieldTrialExperimentGroup();
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AutocompleteFieldTrial);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_FIELD_TRIAL_H_