Revert of [chromeos/about:power] Collect cpuidle and cpufreq stats

chrome/browser/chromeos/power/cpu_data_collector.h

-// 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_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_
-#define CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_
-
-#include <deque>
-#include <map>
-#include <string>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/memory/weak_ptr.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-
-namespace chromeos {
-
-// A class to sample CPU idle state occupancy and freq state occupancy.
-// Collects raw data from sysfs and does not convert it to percentage
-// occupancy. As CPUs can be offline at times, or the system can be suspended at
-// other times, it is best for the consumer of this data to calculate percentage
-// occupancy information using suspend time data from
-// PowerDataCollector::system_resumed_data.
-class CpuDataCollector {
- public:
-  struct StateOccupancySample {
-    StateOccupancySample();
-    ~StateOccupancySample();
-
-    // The time when the data was sampled.
-    base::Time time;
-
-    // Indicates whether the CPU is online.
-    bool cpu_online;
-
-    // A mapping from a CPU state to time spent in that state in milliseconds.
-    // For idle state samples, the name of the state at index i in this vector
-    // is the name at index i in the vector returned by cpu_idle_state_names().
-    // Similarly, for freq state occupancy, similar information is in the vector
-    // returned by cpu_freq_state_names().
-    std::vector<int64> time_in_state;
-  };
-
-  typedef std::deque<StateOccupancySample> StateOccupancySampleDeque;
-
-  const std::vector<std::string>& cpu_idle_state_names() const {
-    return cpu_idle_state_names_;
-  }
-
-  const std::vector<StateOccupancySampleDeque>& cpu_idle_state_data() const {
-    return cpu_idle_state_data_;
-  }
-
-  const std::vector<std::string>& cpu_freq_state_names() const {
-    return cpu_freq_state_names_;
-  }
-
-  const std::vector<StateOccupancySampleDeque>& cpu_freq_state_data() const {
-    return cpu_freq_state_data_;
-  }
-
-  CpuDataCollector();
-  ~CpuDataCollector();
-
-  // Starts a repeating timer which periodically runs a callback to collect
-  // CPU state occupancy samples.
-  void Start();
-
- private:
-  // Posts callbacks to the blocking pool which collect CPU state occupancy
-  // samples from the sysfs.
-  void PostSampleCpuState();
-
-  // Samples CPU idle and CPU freq data from sysfs. This function should run on
-  // the blocking pool as reading from sysfs is a blocking task. Elements at
-  // index i in |idle_samples| and |freq_samples| correspond to the idle and
-  // freq samples of CPU i.
-  void SampleCpuStateOnBlockingPool(
-      std::vector<std::string>* cpu_idle_state_names,
-      std::vector<StateOccupancySample>* idle_samples,
-      std::vector<std::string>* cpu_freq_state_names,
-      std::vector<StateOccupancySample>* freq_samples);
-
-  // This function commits the samples read by SampleCpuStateOnBlockingPool to
-  // |cpu_idle_state_data_| and |cpu_freq_state_data_|. Since UI is the consumer
-  // of CPU idle and freq data, this function should run on the UI thread.
-  void SaveCpuStateSamplesOnUIThread(
-      const std::vector<std::string>* cpu_idle_state_names,
-      const std::vector<StateOccupancySample>* idle_samples,
-      const std::vector<std::string>* cpu_freq_state_names,
-      const std::vector<StateOccupancySample>* freq_samples);
-
-  base::RepeatingTimer<CpuDataCollector> timer_;
-
-  // Names of the idle states.
-  std::vector<std::string> cpu_idle_state_names_;
-
-  // The deque at index <i> in the vector corresponds to the idle state
-  // occupancy data of CPU<i>.
-  std::vector<StateOccupancySampleDeque> cpu_idle_state_data_;
-
-  // Names of the freq states.
-  std::vector<std::string> cpu_freq_state_names_;
-
-  // The deque at index <i> in the vector corresponds to the frequency state
-  // occupancy data of CPU<i>.
-  std::vector<StateOccupancySampleDeque> cpu_freq_state_data_;
-
-  // The number of CPUs on the system. This value is read from the sysfs, and
-  // hence should be read/written to only from the blocking pool.
-  int cpu_count_;
-
-  base::WeakPtrFactory<CpuDataCollector> weak_ptr_factory_;
-  DISALLOW_COPY_AND_ASSIGN(CpuDataCollector);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_