Attaching the USB Association IO consumer code sample.  This is the prototype of the USB video class code driver prototype, it illustrates the usage of USB Association IO protocol.

Usb bus driver in MdeModulePkg implements this protocol (implementation is also in the  patch). The definition is in MdePkg so that it can be implemented by non-edk2 USB bus.
Usb association is a part of USB specification, USB Association IO protocol should be eventually added to UEFI specification.
There are additional comments by Michael Kinney (@mdkinney) in https://github.com/tianocore/edk2/pull/10558

Please take a look and let me know how to proceed.

Thanks,
Oleg


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