Add a mechanism for collecting Rappor samples on a daily interval.

chrome/browser/metrics/metrics_services_manager.cc

Index: chrome/browser/metrics/metrics_services_manager.cc
diff --git a/chrome/browser/metrics/metrics_services_manager.cc b/chrome/browser/metrics/metrics_services_manager.cc
index 74d37107e154e3edde01268538c08bbb0d8fffde..5bfeb6d5cb77362d86c65b8928be00824993d496 100644
--- a/chrome/browser/metrics/metrics_services_manager.cc
+++ b/chrome/browser/metrics/metrics_services_manager.cc
@@ -38,7 +38,7 @@ MetricsService* MetricsServicesManager::GetMetricsService() {
 rappor::RapporService* MetricsServicesManager::GetRapporService() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!rappor_service_)
-    rappor_service_.reset(new rappor::RapporService);
+    rappor_service_.reset(new rappor::RapporService(local_state_));
   return rappor_service_.get();
 }