Omnibox: Create HistoryQuickProvider new scoring field trial.

chrome/browser/autocomplete/autocomplete_field_trial.h

Index: chrome/browser/autocomplete/autocomplete_field_trial.h
diff --git a/chrome/browser/autocomplete/autocomplete_field_trial.h b/chrome/browser/autocomplete/autocomplete_field_trial.h
index 2b6b6288c33465e158ec1391106ccfa2cfc93acd..826020863a8d3f5d825d1f53860b0ca75eade124 100644
--- a/chrome/browser/autocomplete/autocomplete_field_trial.h
+++ b/chrome/browser/autocomplete/autocomplete_field_trial.h
@@ -51,6 +51,21 @@ class AutocompleteFieldTrial {
   // 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);
 };