Log the freshness of the Variations seed in a histogram.

chrome/common/pref_names.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 1263 matching lines @@
 const char kMetricsOngoingLogsProto[] =
     "user_experience_metrics.ongoing_logs_as_protobufs";
 
 // Boolean that is true when bookmark prompt is enabled.
 const char kBookmarkPromptEnabled[] = "bookmark_prompt_enabled";
 
 // Number of times bookmark prompt displayed.
 const char kBookmarkPromptImpressionCount[] =
     "bookmark_prompt_impression_count";
 
+// 64-bit integer serialization of the base::Time from the last successful seed
+// fetch (i.e. when the Variations server responds with 200 or 304).
+const char kVariationsLastFetchTime[] = "variations_last_fetch_time";
+
 // String serialized form of variations seed protobuf.
 const char kVariationsSeed[] = "variations_seed";
 
 // 64-bit integer serialization of the base::Time from the last seed received.
 const char kVariationsSeedDate[] = "variations_seed_date";
 
 // Where profile specific metrics are placed.
 const char kProfileMetrics[] = "user_experience_metrics.profiles";
 
 // The metrics for a profile are stored as dictionary values under the
@@ skipping 1020 matching lines @@
 const char kRLZDisabled[] = "rlz.disabled";
 #endif
 
 #if defined(ENABLE_APP_LIST)
 // The directory in user data dir that contains the profile to be used with the
 // app launcher.
 extern const char kAppListProfile[] = "app_list.profile";
 #endif
 
 }  // namespace prefs