Performance monitor stats gathering.

chrome/browser/performance_monitor/constants.h

Index: chrome/browser/performance_monitor/constants.h
diff --git a/chrome/browser/performance_monitor/constants.h b/chrome/browser/performance_monitor/constants.h
index c8382eb02da72336c4335957a3d41648f3592e8a..1a9defc3b1032a2e12838ecfb6fa1ddf456a6f68 100644
--- a/chrome/browser/performance_monitor/constants.h
+++ b/chrome/browser/performance_monitor/constants.h
@@ -14,11 +14,15 @@ extern const char kMetricNotFoundError[];
 // its activity.
 extern const char kProcessChromeAggregate[];
 
-// When you add a metric type, make sure to edit Database::InitMetricDetails
-// and add an entry to the MericType enum.
-// TODO(mwrosen): When you make real metrics, delete the sample metric.
-extern const char kSampleMetricDescription[];
-extern const char kSampleMetricName[];
+// Metrics keys for statistics gathering.
+// When you add a metric type, make sure to edit CPMDatabase::InitMetricDetails

[Yoyo Zhou, 2012/07/20 20:47:30]

nit: add a period.

+extern const char kMetricCPUUsage[];
+extern const char kMetricCPUUsageDescription[];
+extern const char kMetricPrivateMemoryUsage[];
+extern const char kMetricPrivateMemoryUsageDescription[];
+extern const char kMetricSharedMemoryUsage[];
+extern const char kMetricSharedMemoryUsageDescription[];
+
 extern const char kStateChromeVersion[];
 
 }  // namespace performance_monitor