Adding a previews object, PreviewsDataSavings

components/data_reduction_proxy/core/common/data_savings_recorder.h

Index: components/data_reduction_proxy/core/common/data_savings_recorder.h
diff --git a/components/data_reduction_proxy/core/common/data_savings_recorder.h b/components/data_reduction_proxy/core/common/data_savings_recorder.h
index 461f4173a98214c438e0c3aaa60e913a014eb7ee..a96cf5984bec230034cc60068667834cd3569bc6 100644
--- a/components/data_reduction_proxy/core/common/data_savings_recorder.h
+++ b/components/data_reduction_proxy/core/common/data_savings_recorder.h
@@ -12,18 +12,19 @@
 namespace data_reduction_proxy {
 
 // An interface that will record data savings based on the amount of data used,
 // the original size of the data, and the request type.
 class DataSavingsRecorder {
  public:
   // Records detailed data usage. Assumes |data_used| is recorded already by
   // previous handling of URLRequests. Also records daily data savings
   // statistics to prefs and reports data savings UMA. |data_used| and
   // |original_size| are measured in bytes.
-  virtual void UpdateDataSavings(const std::string& data_usage_host,
+  // Returns true if data savings was recorded.
+  virtual bool UpdateDataSavings(const std::string& data_usage_host,
                                  int64_t data_used,
                                  int64_t original_size) = 0;
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_SAVINGS_RECORDER_H_