Associate variation IDs with uniformity trials.

chrome/browser/chrome_browser_main.cc

 // 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.
 
 #include "chrome/browser/chrome_browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 75 matching lines @@
 #include "chrome/common/child_process_logging.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/env_vars.h"
 #include "chrome/common/json_pref_store.h"
 #include "chrome/common/jstemplate_builder.h"
 #include "chrome/common/logging_chrome.h"
+#include "chrome/common/metrics/experiments_helper.h"
 #include "chrome/common/net/net_resource_provider.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/profiling.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/main_function_params.h"
 #include "grit/app_locale_settings.h"
@@ skipping 931 matching lines @@
       net::SSLConfigService::EnableDomainBoundCertsTrial();
   }
 }
 
 void ChromeBrowserMainParts::SetupUniformityFieldTrials() {
   // One field trial will be created for each entry in this array. The i'th
   // field trial will have |trial_sizes[i]| groups in it, including the default
   // group. Each group will have a probability of 1/|trial_sizes[i]|.
   const int trial_sizes[] = { 100, 20, 10, 5, 2 };
 
+  // Declare our variation ID bases along side this array so we can loop over it
+  // and assign the IDs appropriately. So for example, the 1 percent experiments
+  // should have a size of 100 (100/100 = 1).
+  const chrome_variations::ID trial_base_ids[] = {
+      chrome_variations::kUniformity1PercentBase,
+      chrome_variations::kUniformity5PercentBase,
+      chrome_variations::kUniformity10PercentBase,
+      chrome_variations::kUniformity20PercentBase,
+      chrome_variations::kUniformity50PercentBase
+  };
+
   // Probability per group remains constant for all uniformity trials, what
   // changes is the probability divisor.
   static const base::FieldTrial::Probability kProbabilityPerGroup = 1;
   for (size_t i = 0; i < arraysize(trial_sizes); ++i) {
     const base::FieldTrial::Probability divisor = trial_sizes[i];
 
     const int group_percent = 100 / trial_sizes[i];
     const std::string trial_name =
         StringPrintf("UMA-Uniformity-Trial-%d-Percent", group_percent);
 
     DVLOG(1) << "Trial name = " << trial_name;
 
     scoped_refptr<base::FieldTrial> trial(
         base::FieldTrialList::FactoryGetFieldTrial(
             trial_name, divisor, "default", 2015, 1, 1, NULL));
+    experiments_helper::AssociateGoogleExperimentID(trial_name, "default",
+        trial_base_ids[i]);
     // Loop starts with group 1 because the field trial automatically creates a
     // default group, which would be group 0.
     for (int group_number = 1; group_number < trial_sizes[i]; ++group_number) {
       const std::string group_name = StringPrintf("group_%02d", group_number);
       DVLOG(1) << "    Group name = " << group_name;
       trial->AppendGroup(group_name, kProbabilityPerGroup);
+      experiments_helper::AssociateGoogleExperimentID(trial_name, group_name,
+          static_cast<chrome_variations::ID>(trial_base_ids[i] + group_number));
     }
   }
 }
 
 // ChromeBrowserMainParts: |SetupMetricsAndFieldTrials()| related --------------
 
 void ChromeBrowserMainParts::SetupFieldTrials(bool metrics_recording_enabled,
                                               bool proxy_policy_is_set) {
   // Note: make sure to call ConnectionFieldTrial() before
   // ProxyConnectionsFieldTrial().
@@ skipping 910 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }