Adds option to enable CSS backgrounds for printing.

chrome/browser/resources/print_preview/native_layer.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';
 
   /**
    * An interface to the native Chromium printing system layer.
    * @constructor
@@ skipping 150 matching lines @@
         'printWithCloudPrint': destination != null && !destination.isLocal,
         'deviceName': destination == null ? 'foo' : destination.id,
         'generateDraftData': printTicketStore.isDocumentModifiable,
         'fitToPageEnabled': printTicketStore.isFitToPageEnabled(),
 
         // NOTE: Even though the following fields don't directly relate to the
         // preview, they still need to be included.
         'duplex': printTicketStore.isDuplexEnabled() ?
             NativeLayer.DuplexMode.LONG_EDGE : NativeLayer.DuplexMode.SIMPLEX,
         'copies': printTicketStore.getCopies(),
-        'collate': printTicketStore.isCollateEnabled()
+        'collate': printTicketStore.isCollateEnabled(),
+        'shouldPrintBackgrounds': printTicketStore.isCssBackgroundEnabled()
       };
 
       // Set 'cloudPrintID' only if the destination is not local.
       if (!destination.isLocal) {
         ticket['cloudPrintID'] = destination.id;
       }
 
       if (printTicketStore.hasMarginsCapability() &&
           printTicketStore.getMarginsType() ==
               print_preview.ticket_items.MarginsType.Value.CUSTOM) {
@@ skipping 36 matching lines @@
         'landscape': printTicketStore.isLandscapeEnabled(),
         'color': printTicketStore.isColorEnabled() ?
             NativeLayer.ColorMode_.COLOR : NativeLayer.ColorMode_.GRAY,
         'headerFooterEnabled': printTicketStore.isHeaderFooterEnabled(),
         'marginsType': printTicketStore.getMarginsType(),
         'generateDraftData': true, // TODO(rltoscano): What should this be?
         'duplex': printTicketStore.isDuplexEnabled() ?
             NativeLayer.DuplexMode.LONG_EDGE : NativeLayer.DuplexMode.SIMPLEX,
         'copies': printTicketStore.getCopies(),
         'collate': printTicketStore.isCollateEnabled(),
+        'shouldPrintBackgrounds': printTicketStore.isCssBackgroundEnabled(),
         'previewModifiable': printTicketStore.isDocumentModifiable,
         'printToPDF': destination.id ==
             print_preview.Destination.GooglePromotedId.SAVE_AS_PDF,
         'printWithCloudPrint': !destination.isLocal,
         'deviceName': destination.id,
         'isFirstRequest': false,
         'requestID': -1,
         'fitToPageEnabled': printTicketStore.isFitToPageEnabled()
       };
 
@@ skipping 438 matching lines @@
       return this.serializedAppStateStr_;
     }
   };
 
   // Export
   return {
     NativeInitialSettings: NativeInitialSettings,
     NativeLayer: NativeLayer
   };
 });