Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/tray/system_tray_item.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 ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/login_status.h"
 #include "ash/common/shelf/shelf_types.h"
 #include "base/macros.h"
 
 namespace views {
 class View;
 }
 
 namespace ash {
 class SystemTray;
+class SystemTrayBubble;
 class TrayItemView;
 
 class ASH_EXPORT SystemTrayItem {
  public:
-  explicit SystemTrayItem(SystemTray* system_tray);
+  // The different types of SystemTrayItems.
+  //
+  // NOTE: These values are used for UMA metrics so do NOT re-order this enum
+  // and only insert items before the COUNT item.
+  enum UmaType {
+    // SystemTrayItem's with this type are not recorded in the histogram.
+    UMA_NOT_RECORDED = 0,
+    // Used for testing purposes only.
+    UMA_TEST = 1,
+    UMA_ACCESSIBILITY = 2,
+    UMA_AUDIO = 3,
+    UMA_BLUETOOTH = 4,
+    UMA_CAPS_LOCK = 5,
+    UMA_CAST = 6,
+    UMA_DATE = 7,
+    UMA_DISPLAY = 8,
+    UMA_DISPLAY_BRIGHTNESS = 9,
+    UMA_ENTERPRISE = 10,
+    UMA_IME = 11,
+    UMA_MULTI_PROFILE_MEDIA = 12,
+    UMA_NETWORK = 13,
+    UMA_SETTINGS = 14,
+    UMA_UPDATE = 15,
+    UMA_POWER = 16,
+    UMA_ROTATION_LOCK = 17,
+    UMA_SCREEN_CAPTURE = 18,
+    UMA_SCREEN_SHARE = 19,
+    UMA_SESSION_LENGTH_LIMIT = 20,
+    UMA_SMS = 21,
+    UMA_SUPERVISED_USER = 22,
+    UMA_TRACING = 23,
+    UMA_USER = 24,
+    UMA_VPN = 25,
+    UMA_COUNT = 26,
+  };
+
+  SystemTrayItem(SystemTray* system_tray, UmaType type);
   virtual ~SystemTrayItem();
 
   // Create* functions may return NULL if nothing should be displayed for the
   // type of view. The default implementations return NULL.
 
   // Returns a view to be displayed in the system tray. If this returns NULL,
   // then this item is not displayed in the tray.
   // NOTE: The returned view should almost always be a TrayItemView, which
   // automatically resizes the widget when the size of the view changes, and
   // adds animation when the visibility of the view changes. If a view wants to
@@ skipping 66 matching lines @@
   // the shelf is in the auto-hide state. Default is true.
   virtual bool ShouldShowShelf() const;
 
   // Returns the system tray that this item belongs to.
   SystemTray* system_tray() const { return system_tray_; }
 
   bool restore_focus() const { return restore_focus_; }
   void set_restore_focus(bool restore_focus) { restore_focus_ = restore_focus; }
 
  private:
+  // Accesses uma_type().
+  friend class SystemTrayBubble;
+
+  UmaType uma_type() const { return uma_type_; }
+
   SystemTray* system_tray_;
+  UmaType uma_type_;
   bool restore_focus_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_