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

chrome/browser/resources/file_manager/js/text_measure.js

-// 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.
-
-'use strict';
-
-/**
- * TextMeasure constructor.
- *
- * TextMeasure is a measure for text that returns the width of text.  This
- * class has a dummy span element. When measuring the width of text, it sets
- * the text to the element and obtains the element's size by
- * getBoundingClientRect.
- *
- * @constructor
- * @param {HTMLElement} element Element that has styles of measured text. The
- *     width of text is measures like as it is rendered in this element.
- */
-var TextMeasure = function(element) {
-  var doc = element.ownerDocument;
-  this.dummySpan_ = doc.createElement('span');
-  this.dummySpan_ = doc.getElementsByTagName('body')[0].
-                        appendChild(this.dummySpan_);
-  this.dummySpan_.style.position = 'absolute';
-  this.dummySpan_.style.visibility = 'hidden';
-  var styles = window.getComputedStyle(element, '');
-  var stylesToBeCopied = [
-    'fontSize',
-    'fontStyle',
-    'fontWeight',
-    'fontFamily',
-    'letterSpacing'
-  ];
-  for (var i = 0; i < stylesToBeCopied.length; i++) {
-    this.dummySpan_.style[stylesToBeCopied[i]] = styles[stylesToBeCopied[i]];
-  }
-  Object.seal(this);
-};
-
-/**
- * Measures the width of text.
- *
- * @param {string} text Text that is measured the width.
- * @return {number} Width of the specified text.
- */
-TextMeasure.prototype.getWidth = function(text) {
-  this.dummySpan_.innerText = text;
-  var rect = this.dummySpan_.getBoundingClientRect();
-  return rect ? rect.width : 0;
-};