Add a PDF component extension

chrome/browser/resources/pdf/pdf.js

+// Copyright (c) 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.
+
+(function() {
+
+var plugin;
+var sizer;
+
+function onScroll() {
+  var coordinates = [window.pageXOffset, window.pageYOffset];
+  plugin.postMessage(coordinates);
+}
+
+function handleMessage(message) {
+  if (message.data['type'] == 'document_dimensions') {
+    if (sizer.style.height != message.data['document_height'] + 'px') {
+      sizer.style.height = message.data['document_height'] + 'px';
+      sizer.style.width = message.data['document_width'] + 'px';
+    }
+  }
+}
+
+function load() {
+  window.addEventListener('scroll',
+      function() { webkitRequestAnimationFrame(onScroll); });
+
+  // The pdf location is passed in the document url in the format:
+  // http://<.../pdf.html>?<pdf location>.
+  var url = window.location.search.substring(1);
+  plugin = document.createElement('object');
+  plugin.setAttribute('width', '100%');
+  plugin.setAttribute('height', '100%');
+  plugin.setAttribute('type', 'application/x-google-chrome-pdf');
+  plugin.setAttribute('src', url);
+  plugin.style.zIndex = '1';
+  plugin.style.position = 'fixed';
+  plugin.addEventListener('message', handleMessage, false);
+  document.body.appendChild(plugin);
+
+  sizer = document.createElement('div');
+  sizer.style.zIndex = '0';
+  sizer.style.position = 'absolute';
+  sizer.style.width = '100%';
+  sizer.style.height = '100%';
+  document.body.appendChild(sizer);
+}
+
+load();
+
+})();