Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/tray_accessibility.cc

 // 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.
 
 #include "ash/common/system/tray_accessibility.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/accessibility_types.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 285 matching lines @@
   else if (sender == settings_view_)
     tray_delegate->ShowAccessibilitySettings();
 }
 
 }  // namespace tray
 
 ////////////////////////////////////////////////////////////////////////////////
 // ash::TrayAccessibility
 
 TrayAccessibility::TrayAccessibility(SystemTray* system_tray)
-    : TrayImageItem(system_tray, IDR_AURA_UBER_TRAY_ACCESSIBILITY),
+    : TrayImageItem(system_tray,
+                    IDR_AURA_UBER_TRAY_ACCESSIBILITY,
+                    UMA_ACCESSIBILITY),
       default_(NULL),
       detailed_popup_(NULL),
       detailed_menu_(NULL),
       request_popup_view_state_(A11Y_NONE),
       tray_icon_visible_(false),
       login_(GetCurrentLoginStatus()),
       previous_accessibility_state_(GetAccessibilityState()),
       show_a11y_menu_on_lock_screen_(true) {
   DCHECK(system_tray);
   WmShell::Get()->system_tray_notifier()->AddAccessibilityObserver(this);
@@ skipping 100 matching lines @@
     if (detailed_popup_)
       detailed_popup_->GetWidget()->Close();
     if (detailed_menu_)
       detailed_menu_->GetWidget()->Close();
   }
 
   previous_accessibility_state_ = accessibility_state;
 }
 
 }  // namespace ash