PrintPreview: Honor the print media page size and margin values.

chrome/browser/resources/print_preview/layout_settings.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 LayoutSettings object. This object encapsulates all settings and
    * logic related to layout mode (portrait/landscape).
@@ skipping 82 matching lines @@
       // If the chosen layout is same as before, nothing needs to be done.
       if (this.hasChanged_())
         setDefaultValuesAndRegeneratePreview(true);
     },
 
     /**
      * Listener executing when a |customEvents.PDF_LOADED| event occurs.
      * @private
      */
     onPDFLoaded_: function() {
-      this.fadeInOut_(!previewModifiable);
+      this.fadeInOut_(!previewModifiable || hasPageSizeStyle);
     },
 
     /**
      * @param {boolean} fadeOut True if |this.layoutOption_| should be faded
      *     out, false if it should be faded in.
      * @private
      */
     fadeInOut_: function(fadeOut) {
       fadeOut ? fadeOutOption(this.layoutOption_) :
           fadeInOption(this.layoutOption_);
     }
   };
 
   return {
     LayoutSettings: LayoutSettings,
   };
 });