How to track the Chromebook

You can get this option by following these steps:

1. Sign in to your Chrome device.
2. Click the status area in the lower-right corner, where your account picture appears.
3. Select Settings and Help and find the "People" section.
4. Use the "Require password to wake from sleep" check box to adjust this setting.

Now each time your Chromebook goes to 'sleep' you will need a password at the lock screem.

You can compile and use Sage in a chrooted linux install on a chromebook (requires developer mode). E.g. using crouton (https://github.com/dnschneid/crouton). Another possibility is to just install linux directly, though I suppose that is not what you are asking for.

The sandbox for native chrome apps (i.e. NaCl) is too restrictive for Sage and many other standard unix applications. In particular, you can't fork new processes.