Running Observatory against content_shell:

0) Open your mobile web application in Dart Editor and launch it on mobile.

1) Forward localhost:9222 to the content_shell's remote debugging protocol:

$ adb forward tcp:9222 localabstract:content_shell_devtools_remote

2) Start the Observatory servers:

$ ./run.sh

By default Observatory will be available on localhost:9090

3) Release the content_shell's remote debugging protocol by clicking the 'Stop'
button in the Dart Editor's debugger. By releasing the debugging protocol,
Observatory can communicate with the content_shell.

4) On Observatory's connect to VM page you should see the name of your app 
on the right hand side of the page.