Move MetricsStateManager into the Metrics component.

components/metrics/metrics_pref_names.cc

Index: components/metrics/metrics_pref_names.cc
diff --git a/components/metrics/metrics_pref_names.cc b/components/metrics/metrics_pref_names.cc
index e0b358a19e5fc76ff7a471f24337c846dbe1c87c..e6cbe6084fd0c1e546679a152e67c726c887c8a5 100644
--- a/components/metrics/metrics_pref_names.cc
+++ b/components/metrics/metrics_pref_names.cc
@@ -7,6 +7,31 @@
 namespace metrics {
 namespace prefs {
 
+// The metrics client GUID, entropy source and session 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";

[Alexei Svitkine (slow), 2014/06/02 20:35:43]

This is only used from MetricsService, so I don't think it needs to move.

[blundell, 2014/06/03 15:46:48]

Do you mind if I keep it here now that I've moved it? If I move it back, we'll
just have to move it again when we move MetricsService.

On 2014/06/02 20:35:43, Alexei Svitkine wrote:

[Alexei Svitkine (slow), 2014/06/03 17:37:00]

OK sure. We'll just need to remove the metrics:: prefixes from its use in
MetricsService when MetricsService moves into the component.

+const char kMetricsLowEntropySource[] =
+    "user_experience_metrics.low_entropy_source2";
+
+// 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";
+
+// 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";

[Alexei Svitkine (slow), 2014/06/02 20:35:43]

This pref is actually queried through a callback whose impl lives in
ChromeMetricsServiceClient, so it doesn't need to move...

[blundell, 2014/06/03 15:46:48]

Done.

+// 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";
+
 // 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.