Move MetricsStateManager into the Metrics component.

components/metrics/metrics_pref_names.cc

 // Copyright 2014 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 "components/metrics/metrics_pref_names.h"
 
 namespace metrics {
 namespace prefs {
 
+// The metrics client GUID.
+// Note: The name client_id2 is a result of creating
+// new prefs to do a one-time reset of the previous values.
+const char kMetricsClientID[] = "user_experience_metrics.client_id2";
+
 // Array of strings that are each UMA logs that were supposed to be sent in the
 // first minute of a browser session. These logs include things like crash count
 // info, etc.
 const char kMetricsInitialLogs[] =
     "user_experience_metrics.initial_logs_as_protobufs";
 
+// The metrics entropy source.
+// Note: The name low_entropy_source2 is a result of creating
+// new prefs to do a one-time reset of the previous values.
+const char kMetricsLowEntropySource[] =
+    "user_experience_metrics.low_entropy_source2";
+
 // 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";
 
+// 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. http://crbug.com/357704
+const char kMetricsOldClientID[] = "user_experience_metrics.client_id";
+const char kMetricsOldLowEntropySource[] =
+    "user_experience_metrics.low_entropy_source";
+
 // Array of strings that are each UMA logs that were not sent because the
 // browser terminated before these accumulated metrics could be sent.  These
 // logs typically include histograms and memory reports, as well as ongoing
 // user activities.
 const char kMetricsOngoingLogs[] =
     "user_experience_metrics.ongoing_logs_as_protobufs";
 
 // Boolean that indicates a cloned install has been detected and the metrics
 // client id and low entropy source should be reset.
 const char kMetricsResetIds[] = "user_experience_metrics.reset_metrics_ids";
 
+// 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";
+
+// The metrics client session ID.
+const char kMetricsSessionID[] = "user_experience_metrics.session_id";
+
 }  // namespace prefs
 }  // namespace metrics