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Black usually. Your White Rock is most likely masking Black or Barring, if he is masking black, then you will get sexlinks,( Barred males and Black (solid) females)
Im not really sure if he can be white and masking homozygous barring, but if he is barred, you would most likely be heterozygous barring and when bred to the Barred rock hens, it would give all barred males, half barred females, and half black females. If by chance he was masking homozygous barring, then all of the chicks would be barred and it would be just like if he was a barred rock rooster. Regardless of what you get, the chicks will carry one copy of recessive white and if mated together or back to the white roo, it will produce more white chicks.