pdf.js.diff

diff --git a/web/viewer.html b/web/viewer.html
index d08f639..39b7d9f 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -44,6 +44,8 @@ See https://github.com/adobe-type-tools/cmap-resources
 	<link rel="resource" type="application/l10n" href="locale/locale.properties">
 <!--#endif-->
 
+	<script src="qwebchannel.js"></script>
+
 <!--#if !PRODUCTION-->
 	<script src="../src/shared/compatibility.js"></script>
 <!--#endif-->
diff --git a/web/viewer.js b/web/viewer.js
index 01f2798..d87d3eb 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -18,6 +18,14 @@
 
 var DEFAULT_URL = 'compressed.tracemonkey-pldi-09.pdf';
 
+new QWebChannel(qt.webChannelTransport
+	,function(channel) {
+
+		document.getElementById('download').setAttribute('hidden', 'true');
+
+		var comm = channel.objects.communicator;
+		DEFAULT_URL = comm.url;
+
 if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME')) {
   (function rewriteUrlClosure() {
 	// Run this code outside DOMContentLoaded to make sure that the URL
@@ -194,3 +202,7 @@ if (document.readyState === 'interactive' ||
 } else {
   document.addEventListener('DOMContentLoaded', webViewerLoad, true);
 }
+
+	}
+);
+