[Print Preview]: Added code to support pdf fit to page functionality.

chrome/browser/resources/print_preview/header_footer_settings.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';
 
   /**
    * Creates a HeaderFooterSettings object. This object encapsulates all
    * settings and logic related to the headers and footers checkbox.
@@ skipping 58 matching lines @@
           var pageHeight = pageLayout.marginTop + pageLayout.marginBottom +
                            pageLayout.contentHeight;
           headerFooterApplies =
               (pageLayout.marginTop > pageLayout.printableAreaY) ||
               (pageLayout.marginBottom >
                    (pageHeight - pageLayout.printableAreaY -
                     pageLayout.printableAreaHeight));
         }
       }
       this.setVisible_(headerFooterApplies);
+      var headerFooterEvent = new cr.Event(
+          customEvents.HEADER_FOOTER_VISIBILITY_CHANGED);
+      headerFooterEvent.headerFooterApplies = headerFooterApplies;
+      document.dispatchEvent(headerFooterEvent);
     },
 
     /**
      * Adding listeners to header footer related controls.
      * @private
      */
     addEventListeners_: function() {
       this.headerFooterCheckbox_.onclick =
           this.onHeaderFooterChanged_.bind(this);
       document.addEventListener(customEvents.PDF_LOADED,
@@ skipping 12 matching lines @@
     /**
      * Listener executing when a |customEvents.PDF_LOADED| event occurs.
      * @private
      */
     onPDFLoaded_: function() {
       if (!previewModifiable)
         this.setVisible_(false);
     },
 
     /**
-     * Hides or shows |this.headerFooterOption|.
-     * @param {boolean} visible True if |this.headerFooterOption| should be
+     * Hides or shows |this.headerFooterOption_|.
+     * @param {boolean} visible True if |this.headerFooterOption_| should be
      *     shown.
      * @private
      */
     setVisible_: function(visible) {
-      if (visible)
-        fadeInOption(this.headerFooterOption_);
-      else
-        fadeOutOption(this.headerFooterOption_);
-    }
+        this.headerFooterOption_.style.display = visible ? 'block' : 'none';
+    },
   };
 
   return {
     HeaderFooterSettings: HeaderFooterSettings
   };
 });