[Files.app] Split the JavaScript files into subdirectories: common, background, and foreground

chrome/browser/resources/file_manager/foreground/js/metrics.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.
 
 /**
  * @fileoverview Utility methods for accessing chrome.metricsPrivate API.
  *
  * To be included as a first script in main.html
  */
 
@@ skipping 111 matching lines @@
     'min': 1,
     'max': boundaryValue,
     'buckets': boundaryValue + 1
   };
   metrics.call_('recordValue', [metricDescr, index]);
   if (metrics.log) {
     console.log('chrome.metricsPrivate.recordValue',
         [metricDescr.metricName, index, value]);
   }
 };