Remove the unmaintained performance monitor.

chrome/browser/performance_monitor/startup_timer.h

-// Copyright (c) 2012 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_PERFORMANCE_MONITOR_STARTUP_TIMER_H_
-#define CHROME_BROWSER_PERFORMANCE_MONITOR_STARTUP_TIMER_H_
-
-#include "base/time/time.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-
-namespace performance_monitor {
-
-// This class is responsible for recording the startup and session restore times
-// (if applicable) for PerformanceMonitor. This allows us to initialize this
-// relatively small object early in the startup process, and start the whole of
-// PerformanceMonitor at a later time. StartupTimer will record the times and
-// insert them into PerformanceMonitor's database.
-class StartupTimer : public content::NotificationObserver {
- public:
-  // Indicates the type of startup; i.e. either a normal startup or a testing
-  // environment.
-  enum StartupType {
-    STARTUP_NORMAL,
-    STARTUP_TEST
-  };
-
-  StartupTimer();
-  virtual ~StartupTimer();
-
-  // Inform StartupTimer that the startup process has been completed; stop the
-  // timer. Returns false if the timer has already stopped.
-  bool SignalStartupComplete(StartupType startup_type);
-
-  // Pauses the timer until UnpauseTimer() is called; any time spent within a
-  // pause does not count towards the measured startup time. This will DCHECK if
-  // PauseTimer() is called while paused or UnpauseTimer() is called while
-  // unpaused.
-  static void PauseTimer();
-  static void UnpauseTimer();
-
-  // content::NotificationObserver
-  // We keep track of whether or not PerformanceMonitor has been started via
-  // the PERFORMANCE_MONITOR_INITIALIZED notification; we need to know this so
-  // we know when to insert startup data into the database. We either insert
-  // data as we gather it (if PerformanceMonitor is started prior to data
-  // collection) or at the notification (if PerformanceMonitor is started
-  // later).
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
-  static void SetElapsedSessionRestoreTime(
-      const base::TimeDelta& elapsed_session_restore_time);
-
- private:
-  // Insert the elapsed time measures into PerformanceMonitor's database.
-  void InsertElapsedStartupTime();
-  void InsertElapsedSessionRestoreTime();
-
-  // The time at which the startup process begins (the creation of
-  // ChromeBrowserMain).
-  base::TimeTicks startup_begin_;
-
-  // The time at which the timer was most recently paused, or null if the timer
-  // is not currently paused.
-  base::TimeTicks pause_started_;
-
-  // The total duration for which the timer has been paused.
-  base::TimeDelta total_pause_;
-
-  // A flag of whether or not this was a "normal" startup (e.g. whether or not
-  // this was in a testing environment, which would change the startup time
-  // values). If it is not a normal startup, we use a different metric.
-  StartupType startup_type_;
-
-  // The total duration of the startup process, minus any pauses.
-  base::TimeDelta elapsed_startup_time_;
-
-  // The total duration of the session restore(s), if any occurred. This is
-  // independent of the startup time, because:
-  // - If the user has auto-restore on, the restore is synchronous, and we pause
-  //   the startup timer during the session restore; the restore will not
-  //   interfere with startup timing.
-  // - If Chrome crashed and the user chooses to restore the crashed session,
-  //   then the startup is already completed; the restore will not interfere
-  //   with startup timing.
-  std::vector<base::TimeDelta> elapsed_session_restore_times_;
-
-  // Flag whether or not PerformanceMonitor has been fully started.
-  bool performance_monitor_initialized_;
-
-  content::NotificationRegistrar registrar_;
-
-  // The singleton of this class.
-  static StartupTimer* g_startup_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(StartupTimer);
-};
-
-}  // namespace performance_monitor
-
-#endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_STARTUP_TIMER_H_