Catalysis of the addition of the second glucose residue to the lipid-linked oligosaccharide precursor for N-linked glycosylation; the transfer of glucose from dolichyl phosphate glucose (Dol-P-Glc) on to the lipid-linked oligosaccharide Glc(1)Man(9)GlcNAc(2)-PP-Dol.
dolichyl-P-Glc:Glc1Man9GlcNAc2-PP-dolichyl glucosyltransferase activity