Populate a basic SystemProfileProto in UKM.

components/metrics/metrics_log.h

Index: components/metrics/metrics_log.h
diff --git a/components/metrics/metrics_log.h b/components/metrics/metrics_log.h
index 2150ea4d111a2ee7113cf472547399a7b2b28740..35c8b07ac719ac52966a2c7dec466c45c2db4b8c 100644
--- a/components/metrics/metrics_log.h
+++ b/components/metrics/metrics_log.h
@@ -74,6 +74,9 @@ class MetricsLog {
   // always incrementing for use in measuring time durations.
   static int64_t GetCurrentTime();
 
+  static void RecordCoreSystemProfile(MetricsServiceClient* client,

[Alexei Svitkine (slow), 2017/01/27 21:11:56]

Nit: Comment.

[rkaplow, 2017/01/27 21:57:36]

Done.

+                                      SystemProfileProto* system_profile);
+
   // Records a user-initiated action.
   void RecordUserAction(const std::string& key);
 
@@ -81,6 +84,9 @@ class MetricsLog {
   void RecordHistogramDelta(const std::string& histogram_name,
                             const base::HistogramSamples& snapshot);
 
+
+  // TODO(rkaplow): I think this can be a little refactored as it currently
+  // records a pretty arbitrary set of things.
   // Records the current operating environment, including metrics provided by
   // the specified set of |metrics_providers|.  Takes the list of synthetic
   // trial IDs as a parameter. A synthetic trial is one that is set up