Added help text to PeerConnection test page.

chrome/test/data/webrtc/manual/peerconnection.js

Index: chrome/test/data/webrtc/manual/peerconnection.js
diff --git a/chrome/test/data/webrtc/manual/peerconnection.js b/chrome/test/data/webrtc/manual/peerconnection.js
index bc70abbe65e3c2913fef9186075a30d80d002098..d9554c6fe80f745497d6b966ab6099272c8dbf63 100644
--- a/chrome/test/data/webrtc/manual/peerconnection.js
+++ b/chrome/test/data/webrtc/manual/peerconnection.js
@@ -80,6 +80,14 @@ function showServerHelp() {
     + 'DME%20package:webrtc%5C.googlecode%5C.com.');
 }
 
+function toggleHelp() {
+  var help = document.getElementById('help');
+  if (help.style.display == 'none')
+    help.style.display = 'inline';
+  else
+    help.style.display = 'none';
+}
+
 function clearLog() {
   document.getElementById('messages').innerHTML = '';
   document.getElementById('debug').innerHTML = '';