Seems pretty reasonable to expect it to be this code from the apache shindig library:

http://svn.apache.org/repos/asf/shindig/trunk/features/src/m...

From the file: This code implements a safer random() method that is seeded from screen width/height and (presumably random/unguessable) mouse movement, in an effort to create a better seed for random().

Its aim is to solve the problem of gadgets that are relying on secret RPC tokens to validate identity.