Add device policy to disallow shutdown

ash/metrics/user_metrics_recorder.h

 // Copyright 2013 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 ASH_USER_METRICS_RECORDER_H_
 #define ASH_USER_METRICS_RECORDER_H_
 
 #include "ash/ash_export.h"
 #include "base/timer/timer.h"
 
@@ skipping 91 matching lines @@
 
   // Thumbnail sized overview of windows triggered by pressing the overview key.
   UMA_WINDOW_OVERVIEW,
 
   // Selecting a window in overview mode by pressing the enter key.
   UMA_WINDOW_OVERVIEW_ENTER_KEY,
 
   // Window selection started by beginning an alt+tab cycle. This does not count
   // each step through an alt+tab cycle.
   UMA_WINDOW_CYCLE,
+
+  // Reboot action triggered by the user
+  UMA_ACCEL_RESTART_POWER_BUTTON,
 };
 
 // User Metrics Recorder provides a repeating callback (RecordPeriodicMetrics)
 // on a timer to allow recording of state data over time to the UMA records.
 // Any additional states (in ash) that require monitoring can be added to
 // this class. As well calls to record on action metrics
 // (RecordUserMetricsAction) are passed through the UserMetricsRecorder.
 class ASH_EXPORT UserMetricsRecorder {
  public:
   UserMetricsRecorder();
   ~UserMetricsRecorder();
 
   void RecordUserMetricsAction(ash::UserMetricsAction action);
  private:
   void RecordPeriodicMetrics();
 
   base::RepeatingTimer<UserMetricsRecorder> timer_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_USER_METRICS_RECORDER_H_