building script now append the downloaded depot_tools path in /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/depot_tools:/usr/local/apache-maven/bin env-varible, resolving "File node-webrtc/tools/depot_tools/gclient.py, line 1926, in <module>" issue. Plus put options to sync following as reported https://code.google.com/p/webrtc/issues/detail?id=2790