Adds option to enable CSS backgrounds for printing.

chrome/browser/resources/print_preview/data/ticket_items/css_background.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.ticket_items', function() {
   'use strict';
 
   /**
-   * Margins type ticket item whose value is a
-   * {@link print_preview.ticket_items.MarginsType.Value} that indicates what
-   * predefined margins type to use.
+   * Ticket item whose value is a {@code boolean} that represents whether to
+   * print CSS backgrounds.
    * @param {!print_preview.DocumentInfo} documentInfo Information about the
    *     document to print.
    * @constructor
    * @extends {print_preview.ticket_items.TicketItem}
    */
-  function MarginsType(documentInfo) {
+  function CssBackground(documentInfo) {
     print_preview.ticket_items.TicketItem.call(this);
 
     /**
      * Information about the document to print.
      * @type {!print_preview.DocumentInfo}
      * @private
      */
     this.documentInfo_ = documentInfo;
   };
 
-  /**
-   * Enumeration of margin types. Matches enum MarginType in
-   * printing/print_job_constants.h.
-   * @enum {number}
-   */
-  MarginsType.Value = {
-    DEFAULT: 0,
-    NO_MARGINS: 1,
-    MINIMUM: 2,
-    CUSTOM: 3
-  };
-
-  MarginsType.prototype = {
+  CssBackground.prototype = {
     __proto__: print_preview.ticket_items.TicketItem.prototype,
 
     /** @override */
     wouldValueBeValid: function(value) {
       return true;
     },
 
     /** @override */
     isCapabilityAvailable: function() {
       return this.documentInfo_.isModifiable;
     },
 
     /** @override */
     getDefaultValueInternal: function() {
-      return MarginsType.Value.DEFAULT;
+      return false;
     },
 
     /** @override */
     getCapabilityNotAvailableValueInternal: function() {
-      return MarginsType.Value.DEFAULT;
+      return false;
     }
   };
 
   // Export
   return {
-    MarginsType: MarginsType
+    CssBackground: CssBackground
   };
 });