Add new Autofill experiment to experiment histogram

chrome/browser/autofill/autofill_metrics.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/autofill/autofill_metrics.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/autofill/autofill_type.h"
 
 namespace {
 
 // Server experiments we support.
 enum ServerExperiment {
   NO_EXPERIMENT = 0,
   UNKNOWN_EXPERIMENT,
   ACCEPTANCE_RATIO_06,
   ACCEPTANCE_RATIO_1,
   ACCEPTANCE_RATIO_2,
   ACCEPTANCE_RATIO_4,
   ACCEPTANCE_RATIO_05_WINNER_LEAD_RATIO_15,
   ACCEPTANCE_RATIO_05_WINNER_LEAD_RATIO_25,
   ACCEPTANCE_RATIO_05_WINNER_LEAD_RATIO_15_MIN_FORM_SCORE_5,
   TOOLBAR_DATA_ONLY,
+  ACCEPTANCE_RATIO_04_WINNER_LEAD_RATIO_3_MIN_FORM_SCORE_4,
   NUM_SERVER_EXPERIMENTS
 };
 
 enum FieldTypeGroupForMetrics {
   AMBIGUOUS = 0,
   NAME,
   COMPANY,
   ADDRESS_LINE_1,
   ADDRESS_LINE_2,
   ADDRESS_CITY,
@@ skipping 247 matching lines @@
   else if (experiment_id == "ar4")
     metric = ACCEPTANCE_RATIO_4;
   else if (experiment_id == "ar05wlr15")
     metric = ACCEPTANCE_RATIO_05_WINNER_LEAD_RATIO_15;
   else if (experiment_id == "ar05wlr25")
     metric = ACCEPTANCE_RATIO_05_WINNER_LEAD_RATIO_25;
   else if (experiment_id == "ar05wr15fs5")
     metric = ACCEPTANCE_RATIO_05_WINNER_LEAD_RATIO_15_MIN_FORM_SCORE_5;
   else if (experiment_id == "tbar1")
     metric = TOOLBAR_DATA_ONLY;
+  else if (experiment_id == "ar04wr3fs4")
+    metric = ACCEPTANCE_RATIO_04_WINNER_LEAD_RATIO_3_MIN_FORM_SCORE_4;
 
   DCHECK(metric < NUM_SERVER_EXPERIMENTS);
   UMA_HISTOGRAM_ENUMERATION("Autofill.ServerExperimentId", metric,
                             NUM_SERVER_EXPERIMENTS);
 }