Use a single ToplevelWindowEventHandler for the ash::Shell

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"
 
 namespace ash {
 
 enum UserMetricsAction {
   UMA_ACCEL_KEYBOARD_BRIGHTNESS_DOWN_F6,
   UMA_ACCEL_KEYBOARD_BRIGHTNESS_UP_F7,
   UMA_ACCEL_LOCK_SCREEN_LOCK_BUTTON,
   UMA_ACCEL_LOCK_SCREEN_POWER_BUTTON,
   UMA_ACCEL_MAXIMIZE_RESTORE_F4,
   UMA_ACCEL_PREVWINDOW_F5,
   UMA_ACCEL_EXIT_FIRST_Q,
   UMA_ACCEL_EXIT_SECOND_Q,
   UMA_ACCEL_SHUT_DOWN_POWER_BUTTON,
   UMA_CLOSE_THROUGH_CONTEXT_MENU,
   UMA_GESTURE_OVERVIEW,
   UMA_LAUNCHER_CLICK_ON_APP,
   UMA_LAUNCHER_CLICK_ON_APPLIST_BUTTON,
   UMA_MOUSE_DOWN,
+  UMA_PANEL_MINIMIZE_CAPTION_CLICK,
+  UMA_PANEL_MINIMIZE_CAPTION_GESTURE,
   UMA_SHELF_ALIGNMENT_SET_BOTTOM,
   UMA_SHELF_ALIGNMENT_SET_LEFT,
   UMA_SHELF_ALIGNMENT_SET_RIGHT,
   UMA_STATUS_AREA_AUDIO_CURRENT_INPUT_DEVICE,
   UMA_STATUS_AREA_AUDIO_CURRENT_OUTPUT_DEVICE,
   UMA_STATUS_AREA_AUDIO_SWITCH_INPUT_DEVICE,
   UMA_STATUS_AREA_AUDIO_SWITCH_OUTPUT_DEVICE,
   UMA_STATUS_AREA_BRIGHTNESS_CHANGED,
   UMA_STATUS_AREA_BLUETOOTH_CONNECT_KNOWN_DEVICE,
   UMA_STATUS_AREA_BLUETOOTH_CONNECT_UNKNOWN_DEVICE,
@@ skipping 82 matching lines @@
   void RecordUserMetricsAction(ash::UserMetricsAction action);
  private:
   void RecordPeriodicMetrics();
 
   base::RepeatingTimer<UserMetricsRecorder> timer_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_USER_METRICS_RECORDER_H_