Enabled client side sampling for user metrics reporting.

chrome/browser/metrics/chrome_metrics_services_manager_client.cc

 // Copyright 2015 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/chrome_metrics_services_manager_client.h"
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
 #include "chrome/browser/metrics/chrome_metrics_service_client.h"
 #include "chrome/browser/metrics/variations/chrome_variations_service_client.h"
 #include "chrome/browser/metrics/variations/ui_string_overrider_factory.h"
 #include "chrome/browser/ui/browser_otr_state.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "components/metrics/enabled_state_provider.h"
 #include "components/metrics/metrics_state_manager.h"
 #include "components/prefs/pref_service.h"
 #include "components/rappor/rappor_service.h"
 #include "components/variations/service/variations_service.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace {
 
 // Posts |GoogleUpdateSettings::StoreMetricsClientInfo| on blocking pool thread
 // because it needs access to IO and cannot work from UI thread.
 void PostStoreMetricsClientInfo(const metrics::ClientInfo& client_info) {
   content::BrowserThread::GetBlockingPool()->PostTask(
       FROM_HERE,
       base::Bind(&GoogleUpdateSettings::StoreMetricsClientInfo, client_info));
 }
 
 }  // namespace
 
+const base::Feature kMetricsReportingFeature{"MetricsReporting",
+                                             base::FEATURE_ENABLED_BY_DEFAULT};
+
 class ChromeMetricsServicesManagerClient::ChromeEnabledStateProvider
     : public metrics::EnabledStateProvider {
  public:
   ChromeEnabledStateProvider() {}
   ~ChromeEnabledStateProvider() override {}
 
   bool IsConsentGiven() override {
     return ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled();
   }
 
+  bool IsReportingEnabled() override {
+    return IsConsentGiven() &&
+           base::FeatureList::IsEnabled(kMetricsReportingFeature);
+  }
+
   DISALLOW_COPY_AND_ASSIGN(ChromeEnabledStateProvider);
 };
 
 ChromeMetricsServicesManagerClient::ChromeMetricsServicesManagerClient(
     PrefService* local_state)
     : enabled_state_provider_(new ChromeEnabledStateProvider()),
       local_state_(local_state) {
   DCHECK(local_state);
 
   SetupMetricsStateForChromeOS();
@@ skipping 62 matching lines @@
 ChromeMetricsServicesManagerClient::GetMetricsStateManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!metrics_state_manager_) {
     metrics_state_manager_ = metrics::MetricsStateManager::Create(
         local_state_, enabled_state_provider_.get(),
         base::Bind(&PostStoreMetricsClientInfo),
         base::Bind(&GoogleUpdateSettings::LoadMetricsClientInfo));
   }
   return metrics_state_manager_.get();
 }