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

chrome/browser/resources/print_preview/preview_area.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 PreviewArea object. It represents the area where the preview
    * document is displayed.
@@ skipping 153 matching lines @@
           parseFloat(pluginLocation[0]),
           parseFloat(pluginLocation[1]),
           parseFloat(pluginLocation[2]),
           parseFloat(pluginLocation[3]));
     },
 
     /**
      * Resets the state variables of |this|.
      */
     resetState: function() {
-      if (this.pdfPlugin_) {
+      if (this.pdfPlugin_ && previewModifiable) {
         this.zoomLevel_ = this.pdfPlugin_.getZoomLevel();
         this.pageOffset_ = {
             x: this.pdfPlugin_.pageXOffset(),
             y: this.pdfPlugin_.pageYOffset()
         };
       }
       this.pdfLoaded_ = false;
     },
 
     /**
@@ skipping 105 matching lines @@
       if (cr.isMac)
         $('open-preview-app-throbber').hidden = true;
       this.displayErrorMessageAndNotify(errorMessage);
     }
   };
 
   return {
     PreviewArea: PreviewArea
   };
 });