Move EntropyProvider Source From MetricsService to MetricsServicesManager

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"
@@ skipping 192 matching lines @@
       GetMetricsStateManager(), switches::kDisableBackgroundNetworking,
       chrome_variations::CreateUIStringOverrider());
 }
 
 std::unique_ptr<metrics::MetricsServiceClient>
 ChromeMetricsServicesManagerClient::CreateMetricsServiceClient() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return ChromeMetricsServiceClient::Create(GetMetricsStateManager());
 }
 
+std::unique_ptr<const base::FieldTrial::EntropyProvider>
+ChromeMetricsServicesManagerClient::CreateEntropyProvider() {
+  return GetMetricsStateManager()->CreateDefaultEntropyProvider();
+}
+
 net::URLRequestContextGetter*
 ChromeMetricsServicesManagerClient::GetURLRequestContext() {
   return g_browser_process->system_request_context();
 }
 
 bool ChromeMetricsServicesManagerClient::IsSafeBrowsingEnabled(
     const base::Closure& on_update_callback) {
   // Start listening for updates to SB service state. This is done here instead
   // of in the constructor to avoid errors from trying to instantiate SB
   // service before the IO thread exists.
@@ skipping 50 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();
 }