Refactor print preview web ui

chrome/browser/resources/print_preview/data/size.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.define('print_preview', function() {
+  'use strict';
+
+  /**
+   * Immutable two-dimensional size.
+   * @param {number} width Width of the size.
+   * @param {number} height Height of the size.
+   * @constructor
+   */
+  function Size(width, height) {
+    /**
+     * Width of the size.
+     * @type {number}
+     * @private
+     */
+    this.width_ = width;
+
+    /**
+     * Height of the size.
+     * @type {number}
+     * @private
+     */
+    this.height_ = height;
+  };
+
+  Size.prototype = {
+    /** @return {number} Width of the size. */
+    get width() {
+      return this.width_;
+    },
+
+    /** @return {number} Height of the size. */
+    get height() {
+      return this.height_;
+    },
+
+    /**
+     * @param {print_preview.Size} other Other size object to compare against.
+     * @return {boolean} Whether this size object is equal to another.
+     */
+    equals: function(other) {
+      return other != null &&
+          this.width_ == other.width_ &&
+          this.height_ == other.height_;
+    }
+  };
+
+  // Export
+  return {
+    Size: Size
+  };
+});