OOP PDF: Use an object element for print preview instead of an embed.

chrome/browser/resources/pdf/pdf.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * @return {number} Width of a scrollbar in pixels
  */
 function getScrollbarWidth() {
@@ skipping 37 matching lines @@
                                         this.onPasswordSubmitted_.bind(this));
   this.errorScreen_ = $('error-screen');
 
   // Create the viewport.
   this.viewport_ = new Viewport(window,
                                 this.sizer_,
                                 this.viewportChanged_.bind(this),
                                 this.beforeZoom_.bind(this),
                                 this.afterZoom_.bind(this),
                                 getScrollbarWidth());
-
+  var isPrintPreview =
+      this.streamDetails.originalUrl.indexOf('chrome://print') == 0;
   // Create the plugin object dynamically so we can set its src. The plugin
   // element is sized to fill the entire window and is set to be fixed
   // positioning, acting as a viewport. The plugin renders into this viewport
   // according to the scroll position of the window.
-  this.plugin_ = document.createElement('embed');
+  //
+  // TODO(sammc): Remove special casing for print preview. This is currently
+  // necessary because setting the src for an embed element triggers origin
+  // checking and the PDF extension is not allowed to embed URLs with a scheme
+  // of "chrome", which is used by print preview.
+  this.plugin_ = document.createElement(isPrintPreview ? 'object' : 'embed');
   // NOTE: The plugin's 'id' field must be set to 'plugin' since
   // chrome/renderer/printing/print_web_view_helper.cc actually references it.
   this.plugin_.id = 'plugin';
   this.plugin_.type = 'application/x-google-chrome-pdf';
   this.plugin_.addEventListener('message', this.handlePluginMessage_.bind(this),
                                 false);
 
   // Handle scripting messages from outside the extension that wish to interact
   // with it. We also send a message indicating that extension has loaded and
   // is ready to receive messages.
@@ skipping 511 matching lines @@
               this.streamDetails.tabId != -1);
   },
 
   /**
    * @type {Viewport} the viewport of the PDF viewer.
    */
   get viewport() {
     return this.viewport_;
   }
 };