Add meminfo UMA collection.

metrics_daemon.h

Index: metrics_daemon.h
diff --git a/metrics_daemon.h b/metrics_daemon.h
index 52525182953fee9bb368a0c9776ce0fafd113136..5362750baa81f4e082f6067b0521e45adf36aed5 100644
--- a/metrics_daemon.h
+++ b/metrics_daemon.h
@@ -62,6 +62,8 @@ class MetricsDaemon {
   FRIEND_TEST(MetricsDaemonTest, SessionStateChanged);
   FRIEND_TEST(MetricsDaemonTest, SetUserActiveState);
   FRIEND_TEST(MetricsDaemonTest, SetUserActiveStateTimeJump);
+  FRIEND_TEST(MetricsDaemonTest, ProcessMeminfo);
+  FRIEND_TEST(MetricsDaemonTest, ProcessMeminfo2);
 
   // The power states (see power_states.h).
   enum PowerState {
@@ -125,6 +127,7 @@ class MetricsDaemon {
   static const char kMetricWriteSectorsShortName[];
   static const int kMetricDiskStatsShortInterval;
   static const int kMetricDiskStatsLongInterval;
+  static const int kMetricMeminfoInterval;
   static const int kMetricSectorsIOMax;
   static const int kMetricSectorsBuckets;
   static const char kMetricsDiskStatsPath[];
@@ -234,6 +237,12 @@ class MetricsDaemon {
   void SendMetric(const std::string& name, int sample,
                   int min, int max, int nbuckets);
 
+  // Sends a linear histogram sample to Chrome for transport to UMA. See
+  // MetricsLibrary::SendToUMA in metrics_library.h for a description of the
+  // arguments.
+  void SendLinearMetric(const std::string& name, int sample,
+                        int max, int nbuckets);
+
   // Initializes disk stats reporting.
   void DiskStatsReporterInit();
 
@@ -250,6 +259,20 @@ class MetricsDaemon {
   // Reports disk statistics.
   void DiskStatsCallback();
 
+  // Schedules meminfo collection callback.
+  void ScheduleMeminfoCallback(int wait);
+
+  // Reports memory statistics (static version for glib).  Argument is a glib
+  // artifact.
+  static gboolean MeminfoCallbackStatic(void* handle);
+
+  // Reports memory statistics.  Returns false on failure.
+  gboolean MeminfoCallback();
+
+  // Parses content of /proc/meminfo and sends fields of interest to UMA.
+  // Returns false on errors.
+  gboolean ProcessMeminfo(const char* meminfo);
+
   // Test mode.
   bool testing_;