  We obtain the gluon parton distribution functions (PDFs) in the proton within
the extended light-front holographic QCD framework, where the proton couples
with the spin-two Pomeron in Anti-de Sitter space, together with constraints
imposed by the Veneziano model. The gluon helicity asymmetry, after satisfying
the perturbative QCD constraints at small and large longitudinal momentum
regions, agrees with existing experimental measurements. The polarized gluon
distribution is consistent with global analyses. We predict the gluon helicity
contribution to the proton spin, $\Delta G=0.221^{+0.056}_{-0.044}$, close to
the recent analysis with updated data sets and PHENIX measurement and the
lattice QCD simulations. We subsequently present the unpolarized and polarized
gluon generalized parton distributions in the proton.
