UMA for data savings displayed to users.

components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
index 6206adda68fd26af1eb2a4cdb856d5decaf51afa..0ed7d1b386c3d349b91409ca857c29068d290f5c 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
@@ -132,6 +132,11 @@ class DataReductionProxyCompressionStats {
                                 DataReductionProxyRequestType request_type,
                                 base::Time now);
 
+  // Record UMA with data savings bytes and percent over the past
+  // |DataReductionProxy::kNumDaysInHistorySummary| days. These numbers
+  // are displayed to users as their data savings.
+  void RecordUserVisibleDataSavings();
+
   PrefService* pref_service_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   const base::TimeDelta delay_;