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

chrome/browser/resources/file_manager/js/tree.css.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';
-
-/**
- * Custom version of chrome://resources/css/tree.css.js, adding support for
- * inverted arrow icons.
- */
-(function() {
-  /**
-   * @type {number}
-   * @const
-   */
-  var WIDTH = 14;
-
-  /**
-   * @type {number}
-   * @const
-   */
-  var HEIGHT = WIDTH / 2 + 2;
-
-  /**
-   * @type {number}
-   * @const
-   */
-  var MARGIN = 1;
-
-  /**
-   * @param {string} name CSS canvas identifier.
-   * @param {string} backgroundColor Background color.
-   * @param {string} strokeColor Outline color.
-   */
-  function prepareTriangle(name, backgroundColor, strokeColor) {
-    var ctx = document.getCSSCanvasContext('2d',
-                                           name,
-                                           WIDTH + MARGIN * 2,
-                                           HEIGHT + MARGIN * 2);
-
-    ctx.fillStyle = backgroundColor;
-    ctx.strokeStyle = strokeColor;
-    ctx.translate(MARGIN, MARGIN);
-
-    ctx.beginPath();
-    ctx.moveTo(0, 0);
-    ctx.lineTo(0, 2);
-    ctx.lineTo(WIDTH / 2, HEIGHT);
-    ctx.lineTo(WIDTH, 2);
-    ctx.lineTo(WIDTH, 0);
-    ctx.closePath();
-    ctx.fill();
-    ctx.stroke();
-  }
-
-  prepareTriangle(
-      'tree-triangle', 'rgba(122, 122, 122, 0.6)', 'rgba(0, 0, 0, 0)');
-  prepareTriangle('tree-triangle-inverted', '#ffffff', '#ffffff');
-})();