Print Preview: Adding UI for margin settings.

chrome/browser/resources/print_preview/print_header.js

 // Copyright (c) 2011 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';
 
   /**
    * Creates a PrintHeader object. This object encapsulates all the elements
    * and logic related to the top part of the left pane in print_preview.html.
@@ skipping 70 matching lines @@
     updateSummary_: function() {
       var printToPDF = getSelectedPrinterName() == PRINT_TO_PDF;
       var copies = printToPDF ? 1 : copiesSettings.numberOfCopies;
 
       if ((!printToPDF && !copiesSettings.isValid()) ||
           !pageSettings.isPageSelectionValid()) {
         this.summary_.innerHTML = '';
         return;
       }
 
+      if (!marginSettings.areMarginSettingsValid()) {
+        this.summary_.innerHTML = '';
+        return;
+      }
+
       var pageSet = pageSettings.selectedPagesSet;
       var numOfSheets = pageSet.length;
       var summaryLabel =
           localStrings.getString('printPreviewSheetsLabelSingular');
       var numOfPagesText = '';
       var pagesLabel = localStrings.getString('printPreviewPageLabelPlural');
 
       if (printToPDF)
         summaryLabel = localStrings.getString('printPreviewPageLabelSingular');
 
@@ skipping 22 matching lines @@
       // Removing extra spaces from within the string.
       html = html.replace(/\s{2,}/g, ' ');
       this.summary_.innerHTML = html;
     },
   };
 
   return {
     PrintHeader: PrintHeader,
   };
 });