[Chromoting] Let the webapp detect new clipboard text items when it gets focus.

remoting/webapp/main.html

Index: remoting/webapp/main.html
diff --git a/remoting/webapp/main.html b/remoting/webapp/main.html
index 2e58515f4f4a4c103043c3f932487aad302dc799..03241e6e171b0232a82267baf4eb489d7582b2db 100644
--- a/remoting/webapp/main.html
+++ b/remoting/webapp/main.html
@@ -20,6 +20,7 @@ found in the LICENSE file.
     <script src="client_plugin_v1.js"></script>
     <script src="client_screen.js"></script>
     <script src="client_session.js"></script>
+    <script src="clipboard.js"></script>
     <script src="connection_history.js"></script>
     <script src="connection_stats.js"></script>
     <script src="daemon_plugin.js"></script>