Control data saver pingback reporting fraction with protobuf

components/data_reduction_proxy/core/browser/data_reduction_proxy_service.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_service.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.cc
index 0ae4abcbaf88ac3bed9361465b68cf4c7f7dbcab..a0ca5ba5a210a2b0f66e6c3ae8d4bdd783016509 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.cc
@@ -255,20 +255,26 @@ void DataReductionProxyService::SetProxyPrefs(bool enabled, bool at_startup) {
   DCHECK(CalledOnValidThread());
   if (io_task_runner_->BelongsToCurrentThread()) {
     io_data_->SetProxyPrefs(enabled, at_startup);
     return;
   }
   io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&DataReductionProxyIOData::SetProxyPrefs, io_data_,
                             enabled, at_startup));
 }
 
+void DataReductionProxyService::SetPingbackReportingFraction(
+    float pingback_reporting_fraction) {
+  DCHECK(CalledOnValidThread());
+  pingback_client_->SetPingbackReportingFraction(pingback_reporting_fraction);
+}
+
 void DataReductionProxyService::LoadHistoricalDataUsage(
     const HistoricalDataUsageCallback& load_data_usage_callback) {
   std::unique_ptr<std::vector<DataUsageBucket>> data_usage(
       new std::vector<DataUsageBucket>());
   std::vector<DataUsageBucket>* data_usage_ptr = data_usage.get();
   db_task_runner_->PostTaskAndReply(
       FROM_HERE, base::Bind(&DBDataOwner::LoadHistoricalDataUsage,
                             db_data_owner_->GetWeakPtr(),
                             base::Unretained(data_usage_ptr)),
       base::Bind(load_data_usage_callback, base::Passed(&data_usage)));