One-time reset of UMA client ids and low entropy source.

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"
 #include "chrome/common/pref_font_webkit_names.h"
 
 namespace prefs {
@@ skipping 1344 matching lines @@
 const char kSSLVersionMin[] = "ssl.version_min";
 const char kSSLVersionMax[] = "ssl.version_max";
 const char kCipherSuiteBlacklist[] = "ssl.cipher_suites.blacklist";
 const char kEnableOriginBoundCerts[] = "ssl.origin_bound_certs.enabled";
 const char kDisableSSLRecordSplitting[] = "ssl.ssl_record_splitting.disabled";
 
 // A boolean pref of the EULA accepted flag.
 const char kEulaAccepted[] = "EulaAccepted";
 
 // The metrics client GUID, entropy source and session ID.
-const char kMetricsClientID[] = "user_experience_metrics.client_id";
+// Note: The names client_id2 and low_entropy_source2 are a result of creating
+// new prefs to do a one-time reset of the previous values.
+const char kMetricsClientID[] = "user_experience_metrics.client_id2";
 const char kMetricsSessionID[] = "user_experience_metrics.session_id";
 const char kMetricsLowEntropySource[] =
-    "user_experience_metrics.low_entropy_source";
+    "user_experience_metrics.low_entropy_source2";
 const char kMetricsPermutedEntropyCache[] =
     "user_experience_metrics.permuted_entropy_cache";
 
-// Date/time when the current metrics profile ID was created
-// (which hopefully corresponds to first run).
-const char kMetricsClientIDTimestamp[] =
-    "user_experience_metrics.client_id_timestamp";
+// Old client id and low entropy source values, cleared the first time this
+// version is launched.
+// TODO(asvitkine): Delete these after a few releases have gone by and old
+// values have been cleaned up.

[Ilya Sherman, 2014/03/28 18:23:06]

nit: Same thing here.

[Alexei Svitkine (slow), 2014/03/28 18:40:19]

Done.

+const char kMetricsOldClientID[] = "user_experience_metrics.client_id";
+const char kMetricsOldLowEntropySource[] =
+    "user_experience_metrics.low_entropy_source";
 
 // Boolean that specifies whether or not crash reporting and metrics reporting
 // are sent over the network for analysis.
 const char kMetricsReportingEnabled[] =
     "user_experience_metrics.reporting_enabled";
+// Date/time when the user opted in to UMA and generated the client id for the
+// very first time (local machine time, stored as a 64-bit time_t value).
+const char kMetricsReportingEnabledTimestamp[] =
+    "user_experience_metrics.client_id_timestamp";
 
 // A machine ID used to detect when underlying hardware changes. It is only
 // stored locally and never transmitted in metrics reports.
 const char kMetricsMachineId[] = "user_experience_metrics.machine_id";
 
 // Boolean that specifies whether or not crash reports are sent
 // over the network for analysis.
 #if defined(OS_ANDROID)
 const char kCrashReportingEnabled[] =
     "user_experience_metrics_crash.reporting_enabled";
@@ skipping 1199 matching lines @@
 // "mapped_title" entries, detailing the bookmark target URL (if any), the title
 // given by the PartnerBookmarksProvider and either the user-visible renamed
 // title or an empty string if the bookmark node was removed.
 const char kPartnerBookmarkMappings[] = "partnerbookmarks.mappings";
 #endif
 
 // Whether DNS Quick Check is disabled in proxy resolution.
 const char kQuickCheckEnabled[] = "proxy.quick_check_enabled";
 
 }  // namespace prefs