Adds a method to the Performance Monitor Database to fetch the most recent metric.

chrome/browser/performance_monitor/database.h

Index: chrome/browser/performance_monitor/database.h
diff --git a/chrome/browser/performance_monitor/database.h b/chrome/browser/performance_monitor/database.h
index ecd368958dc6ec3bc486db40f4dfd26af293703a..2c61e4641770769329d9f984e1842b7cfa32b34c 100644
--- a/chrome/browser/performance_monitor/database.h
+++ b/chrome/browser/performance_monitor/database.h
@@ -158,6 +158,18 @@ class Database {
   std::vector<std::string> GetActiveActivities(MetricType metric_type,
                                                const base::Time& start);
 
+  // Populate info with the most recent activity. Return false if populate
+  // was unsuccessful.
+  bool GetRecentStatsForActivityAndMetric(const std::string& activity,
+                                          MetricType metric,
+                                          MetricInfo* info);
+
+  bool GetRecentStatsForActivityAndMetric(MetricType metric, MetricInfo* info) {
+    return GetRecentStatsForActivityAndMetric(kProcessChromeAggregate,
+                                              metric,
+                                              info);
+  }
+
   // Query given |metric_type| and |activity|.
   MetricInfoVector GetStatsForActivityAndMetric(const std::string& activity,
                                                 MetricType metric_type,