Add ProcessPowerCollector to audit power information.

chrome/browser/power/process_power_collector.h

Index: chrome/browser/power/process_power_collector.h
diff --git a/chrome/browser/power/process_power_collector.h b/chrome/browser/power/process_power_collector.h
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+++ b/chrome/browser/power/process_power_collector.h
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_POWER_PROCESS_POWER_COLLECTOR_H_
+#define CHROME_BROWSER_POWER_PROCESS_POWER_COLLECTOR_H_
+
+#include <map>
+
+#include "base/memory/linked_ptr.h"
+#include "base/process/process_handle.h"
+#include "base/process/process_metrics.h"
+#include "base/timer/timer.h"
+#include "components/power/origin_power_map_factory.h"
+#include "url/gurl.h"
+
+#if defined(OS_CHROMEOS)
+#include "chromeos/dbus/power_manager_client.h"
+#endif
+
+class Profile;
+
+namespace content {
+class RenderProcessHost;
+}
+
+#if defined(OS_CHROMEOS)
+namespace power_manager {
+class PowerSupplyProperties;
+}
+#endif
+
+// Manages regular updates of the profile power consumption.
+class ProcessPowerCollector
+#if defined(OS_CHROMEOS)
+    : public chromeos::PowerManagerClient::Observer
+#endif
+      {
+ public:
+  class PerProcessData {
+   public:
+    PerProcessData(scoped_ptr<base::ProcessMetrics> metrics,
+                   const GURL& origin,
+                   Profile* profile);
+    PerProcessData();
+    ~PerProcessData();
+
+    base::ProcessMetrics* metrics() const { return metrics_.get(); }
+    Profile* profile() const { return profile_; }
+    GURL last_origin() const { return last_origin_; }
+    int last_cpu_percent() const { return last_cpu_percent_; }
+    bool seen_this_cycle() const { return seen_this_cycle_; }
+    void set_last_cpu_percent(double new_cpu) { last_cpu_percent_ = new_cpu; }
+    void set_seen_this_cycle(bool seen) { seen_this_cycle_ = seen; }
+
+   private:
+    // |metrics_| holds the ProcessMetrics information for the given process.
+    scoped_ptr<base::ProcessMetrics> metrics_;
+
+    // |profile| is the profile that is visiting the |last_origin_|.
+    // It is not owned by PerProcessData.
+    Profile* profile_;
+
+    // |last_origin_| is the last origin visited by the process.
+    GURL last_origin_;
+
+    // |last_cpu_percent_| is the proportion of the CPU used since the last
+    // query.
+    double last_cpu_percent_;
+
+    // |seen_this_cycle| represents if the process still exists in this cycle.
+    // If it doesn't, we erase the PerProcessData.
+    bool seen_this_cycle_;
+
+    DISALLOW_COPY_AND_ASSIGN(PerProcessData);
+  };
+
+  // A map from all process handles to a metric.
+  typedef std::map<base::ProcessHandle, linked_ptr<PerProcessData> >
+      ProcessMetricsMap;
+  // A callback used to define mock CPU usage for testing.
+  typedef base::Callback<double(base::ProcessHandle)> CpuUsageCallback;
+
+  // On Chrome OS, can only be initialized after the DBusThreadManager has been
+  // initialized.
+  ProcessPowerCollector();
+  // On Chrome OS, can only be destroyed before DBusThreadManager is.
+  virtual ~ProcessPowerCollector();
+
+  void set_cpu_usage_callback_for_testing(const CpuUsageCallback& callback) {
+    cpu_usage_callback_ = callback;
+  }
+
+  ProcessMetricsMap* metrics_map_for_testing() { return &metrics_map_; }
+
+#if defined(OS_CHROMEOS)
+  // PowerManagerClient::Observer implementation:
+  virtual void PowerChanged(
+      const power_manager::PowerSupplyProperties& prop) OVERRIDE;
+#endif
+
+  // Begin periodically updating the power consumption numbers by profile.
+  void Initialize();
+
+  // Calls UpdatePowerConsumption() and returns the total CPU percent.
+  double UpdatePowerConsumptionForTesting();
+
+ private:
+  // Calls SynchronizerProcesses() and RecordCpuUsageByOrigin() to update the
+  // |metrics_map_| and attribute power consumption. Invoked by |timer_| and as
+  // a helper method for UpdatePowerConsumptionForTesting().
+  double UpdatePowerConsumption();
+
+  // Calls UpdatePowerConsumption(). Invoked by |timer_|.
+  void HandleUpdateTimeout();
+
+  // Synchronizes the currently active processes to the |metrics_map_| and
+  // returns the total amount of cpu usage in the cycle.
+  double SynchronizeProcesses();
+
+  // Attributes the power usage to the profiles and origins using the
+  // information from SynchronizeProcesses() given a total amount
+  // of CPU used in this cycle, |total_cpu_percent|.
+  void RecordCpuUsageByOrigin(double total_cpu_percent);
+
+  // Adds the information from a given RenderProcessHost to the |metrics_map_|
+  // for a given origin. Called by SynchronizeProcesses().
+  void UpdateProcessInMap(const content::RenderProcessHost* render_process,
+                          const GURL& origin);
+
+  ProcessMetricsMap metrics_map_;
+  base::RepeatingTimer<ProcessPowerCollector> timer_;
+
+  // Callback to use to get CPU usage if set.
+  CpuUsageCallback cpu_usage_callback_;
+
+  // The factor to scale the CPU usage by.
+  double scale_factor_;
+
+  bool is_initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessPowerCollector);
+};
+
+#endif  // CHROME_BROWSER_POWER_PROCESS_POWER_COLLECTOR_H_