add missing *ProtocolReaderWithRefill::skipBytes
add missing *ProtocolReaderWithRefill::skipBytes

Summary:
Need to make sure there is enough input before attempting to skip the
cursor.

Reviewed By: ot, kletkavrubashku, luciang

Differential Revision: D32552700

fbshipit-source-id: 624601cccd2d63e96bfa5596aafc24417cddf2d8

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift