Pref to update daily content lengths with the latest values.

components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h
index 97662957e1e8825fde60a6011ca27d54e73b24a3..7b959df52c53d4847c76e8ba918774872a4316dc 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h
@@ -11,9 +11,11 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.h"
 
+class PrefChangeRegistrar;
 class PrefService;
 
 namespace base {
@@ -45,6 +47,10 @@ public:
   // |list_pref_map_|.
   void Init();
 
+  void ShutdownOnUIThread();
+
+  void OnUpdateContentLengths();
+
   // Gets the int64 pref at |pref_path| from the |DataReductionProxyPrefMap|.
   int64 GetInt64(const char* pref_path);
 
@@ -92,6 +98,8 @@ private:
   DataReductionProxyPrefMap pref_map_;
   DataReductionProxyListPrefMap list_pref_map_;
   base::WeakPtrFactory<DataReductionProxyStatisticsPrefs> weak_factory_;
+  scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
+  base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyStatisticsPrefs);
 };