Performance monitor stats gathering.

chrome/browser/performance_monitor/performance_monitor.h

Index: chrome/browser/performance_monitor/performance_monitor.h
diff --git a/chrome/browser/performance_monitor/performance_monitor.h b/chrome/browser/performance_monitor/performance_monitor.h
index c74ee7ae6921319716efbbd2e195f44cbdfcee94..b0875669102ed7b08c4961d1deedbb4280649486 100644
--- a/chrome/browser/performance_monitor/performance_monitor.h
+++ b/chrome/browser/performance_monitor/performance_monitor.h
@@ -5,12 +5,16 @@
 #ifndef CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
 #define CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
 
+#include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/file_path.h"
+#include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
+#include "base/process.h"
+#include "base/process_util.h"
 #include "base/timer.h"
 #include "chrome/browser/performance_monitor/database.h"
 #include "chrome/browser/performance_monitor/event.h"
@@ -26,6 +30,9 @@ class PerformanceMonitor : public content::NotificationObserver {
  public:
   typedef base::Callback<void(const std::string&)> StateValueCallback;
 
+  typedef std::map<base::ProcessHandle,
+                   linked_ptr<base::ProcessMetrics> > MetricsMap;
+
   // Set the path which the PerformanceMonitor should use for the database files
   // constructed. This must be done prior to the initialization of the
   // PerformanceMonitor. Returns true on success, false on failure (failure
@@ -41,6 +48,9 @@ class PerformanceMonitor : public content::NotificationObserver {
   // start collecting data.
   void Start();
 
+  // Gathers CPU usage and memory usage of all Chrome processes.
+  void GatherStatisticsOnBackgroundThread();
+
   // content::NotificationObserver
   // Wait for various notifications; insert events into the database upon
   // occurance.
@@ -89,6 +99,16 @@ class PerformanceMonitor : public content::NotificationObserver {
 
   void AddEventOnBackgroundThread(scoped_ptr<Event> event);
 
+  // Gathers the CPU usage of every Chrome process that has been running since
+  // the last call to GatherStatistics().
+  void GatherCPUUsageOnBackgroundThread();
+
+  // Gathers the memory usage of every process in the current list of processes.
+  void GatherMemoryUsageOnBackgroundThread();
+
+  // Updates the ProcessMetrics map with the current list of processes.
+  void UpdateMetricsMapOnBackgroundThread();
+
   // Gets the corresponding value of |key| from the database, and then runs
   // |callback| on the UI thread with that value as a parameter.
   void GetStateValueOnBackgroundThread(
@@ -113,6 +133,9 @@ class PerformanceMonitor : public content::NotificationObserver {
 
   scoped_ptr<Database> database_;
 
+  // A map of currently running ProcessHandles to ProcessMetrics.
+  MetricsMap metrics_map_;
+
   // The timer to signal PerformanceMonitor to perform its timed collections.
   base::RepeatingTimer<PerformanceMonitor> timer_;