Field trial to investigate higher weightings for hits when calculating Omnibox prerender confidence.

chrome/browser/autocomplete/network_action_predictor.h

Index: chrome/browser/autocomplete/network_action_predictor.h
diff --git a/chrome/browser/autocomplete/network_action_predictor.h b/chrome/browser/autocomplete/network_action_predictor.h
index 0f3068a336c828e5d9593985ba6a84022d922a41..a8351e41adbc75359db727789fb61919dba779db 100644
--- a/chrome/browser/autocomplete/network_action_predictor.h
+++ b/chrome/browser/autocomplete/network_action_predictor.h
@@ -51,6 +51,9 @@ class NetworkActionPredictor
   explicit NetworkActionPredictor(Profile* profile);
   virtual ~NetworkActionPredictor();
 
+  static void set_hit_weight(double weight) { hit_weight_ = weight; }
+  static double get_hit_weight() { return hit_weight_; }
+
   // Registers an AutocompleteResult for a given |user_text|. This will be used
   // when the user navigates from the Omnibox to determine early opportunities
   // to predict their actions.
@@ -115,6 +118,11 @@ class NetworkActionPredictor
 
   static const int kMaximumDaysToKeepEntry;
 
+  // Multiplying factor applied to the |number_of_hits| for a database entry
+  // when calculating the confidence. It is currently set by a field trial so is
+  // static. Once the field trial ends, this will be a constant value.
+  static double hit_weight_;
+
   // ProfileKeyedService
   virtual void Shutdown() OVERRIDE;