Add a Record button to the web-app if the host supports video recording.

remoting/webapp/client_screen.js

Index: remoting/webapp/client_screen.js
diff --git a/remoting/webapp/client_screen.js b/remoting/webapp/client_screen.js
index 58a2a057483f69488408bff13a5486752e0a15b0..9bd5ef3788eb2ca57cba82e955090c0f2180a89d 100644
--- a/remoting/webapp/client_screen.js
+++ b/remoting/webapp/client_screen.js
@@ -360,6 +360,10 @@ remoting.onConnected = function(clientSession) {
  * @return {boolean} Return true if the extension message was recognized.
  */
 remoting.onExtensionMessage = function(type, data) {
+  if (remoting.clientSession &&
+      remoting.clientSession.handleVideoRecorderMessage(type, data)) {

[Jamie, 2014/08/01 01:28:36]

Since handleVideoRecorderMessage has side-effects, I think this would be clearer
as:

if (remoting.clientSession) {
  return remoting.clientSession.handleVideoRecorderMessage(type, data);
}

[Wez, 2014/08/19 00:15:52]

Done.

+    return true;
+  }
   return false;
 };