Hi,
Indeed unfortunately there is no example for the FRM-KL25 platform which includes the Universal Bus Controller class. In the Erich Styger's blog you can find some examples about Processor Expert to set the FRM-KL25 as an HID device. (Using the FRDM-KL25Z as a USB Mouse Device | MCU on Eclipse).
Also you can have a look at the S08JM documentation in the Freescale's Website about USB (S08JM: 8-bit USB Cost-Effective JM MCUs). In the Training and Support section you can find helpful information about USB and its different classes.
I Hope this information can help you.
Adrian SC
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