Add UMA stats for storage manager for Chrome OS.

chrome/browser/resources/options/browser_options.js

 // 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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            childUser: (boolean|undefined),
  *            hasError: (boolean|undefined),
@@ skipping 337 matching lines @@
         };
         $('pointer-settings-button').onclick = function(evt) {
           PageManager.showPageByName('pointer-overlay');
           chrome.send('coreOptionsUserMetricsAction',
                       ['Options_ShowTouchpadSettings']);
         };
         if (loadTimeData.getBoolean('enableStorageManager')) {
           $('storage-manager-button').hidden = false;
           $('storage-manager-button').onclick = function(evt) {
             PageManager.showPageByName('storage');
+            chrome.send('coreOptionsUserMetricsAction',
+                        ['Options_ShowStorageManager']);
           };
         }
       }
 
       // Search section.
       $('manage-default-search-engines').onclick = function(event) {
         PageManager.showPageByName('searchEngines');
         chrome.send('coreOptionsUserMetricsAction',
                     ['Options_ManageSearchEngines']);
       };
@@ skipping 2065 matching lines @@
 
       settings.hidden = !isVisible;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });