Add a histogram to count requests to variations server.

chrome/browser/metrics/variations/variations_service.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/metrics/variations/variations_service.h"
 
 #include <set>
 
 #include "base/build_time.h"
 #include "base/command_line.h"
@@ skipping 226 matching lines @@
     web_resource::ResourceRequestAllowedNotifier* notifier,
     PrefService* local_state,
     metrics::MetricsStateManager* state_manager)
     : local_state_(local_state),
       state_manager_(state_manager),
       policy_pref_service_(local_state),
       seed_store_(local_state),
       create_trials_from_seed_called_(false),
       initial_request_completed_(false),
       resource_request_allowed_notifier_(notifier),
+      request_count_(0),
       weak_ptr_factory_(this) {
   resource_request_allowed_notifier_->Init(this);
 }
 
 VariationsService::~VariationsService() {
 }
 
 bool VariationsService::CreateTrialsFromSeed() {
   create_trials_from_seed_called_ = true;
 
@@ skipping 208 matching lines @@
   pending_seed_request_->Start();
 
   const base::TimeTicks now = base::TimeTicks::Now();
   base::TimeDelta time_since_last_fetch;
   // Record a time delta of 0 (default value) if there was no previous fetch.
   if (!last_request_started_time_.is_null())
     time_since_last_fetch = now - last_request_started_time_;
   UMA_HISTOGRAM_CUSTOM_COUNTS("Variations.TimeSinceLastFetchAttempt",
                               time_since_last_fetch.InMinutes(), 0,
                               base::TimeDelta::FromDays(7).InMinutes(), 50);
+  UMA_HISTOGRAM_COUNTS_100("Variations.RequestCount", request_count_);
+  ++request_count_;
   last_request_started_time_ = now;
 }
 
 void VariationsService::StoreSeed(const std::string& seed_data,
                                   const std::string& seed_signature,
                                   const base::Time& date_fetched) {
   scoped_ptr<variations::VariationsSeed> seed(new variations::VariationsSeed);
   if (!seed_store_.StoreSeedData(seed_data, seed_signature, date_fetched,
                                  seed.get())) {
     return;
@@ skipping 231 matching lines @@
   // Otherwise, update the pref with the current Chrome version and country.
   base::ListValue new_list_value;
   new_list_value.AppendString(version.GetString());
   new_list_value.AppendString(seed.country_code());
   local_state_->Set(prefs::kVariationsPermanentConsistencyCountry,
                     new_list_value);
   return seed.country_code();
 }
 
 }  // namespace chrome_variations