Pref to update daily content lengths with the latest values.

components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc

Index: components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc
diff --git a/components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc b/components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc
index 20f9465af5cf15ac9a3b4e882025254a6e8c958a..a086117038ec4783bee2bb4d5de35752190007a9 100644
--- a/components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc
+++ b/components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc
@@ -93,5 +93,12 @@ const char kHttpOriginalContentLength[] = "http_original_content_length";
 const char kStatisticsPrefsMigrated[] =
     "data_reduction.statistics_prefs_migrated";
 
+// Pref to indicate that the kDailyHttpOriginalContentLength and
+// kDailyHttpReceivedContentLength prefs must be updated with their latest
+// value. These values are cached in memory on platforms other than Android and
+// iOS for performance reasons.
+const char kUpdateDailyReceivedContentLengths[] =
+    "data_reduction.update_daily_lengths";
+
 }  // namespace prefs
 }  // namespace data_reduction_proxy