Support list-style-image in stylo. r=manishearth
Support list-style-image in stylo. r=manishearth

MozReview-Commit-ID: HyGWZevQYEo

emilio/servo,dsandeephegde/servo,pyfisch/servo,szeged/servo,paulrouget/servo,sadmansk/servo,ConnorGBrewster/servo,emilio/servo,canaltinova/servo,nnethercote/servo,mattnenterprise/servo,saneyuki/servo,upsuper/servo,notriddle/servo,paulrouget/servo,DominoTree/servo,DominoTree/servo,mbrubeck/servo,eddyb/servo,szeged/servo,sadmansk/servo,splav/servo,nnethercote/servo,KiChjang/servo,pyfisch/servo,SimonSapin/servo,SimonSapin/servo,mattnenterprise/servo,avadacatavra/servo,DominoTree/servo,dati91/servo,KiChjang/servo,mbrubeck/servo,paulrouget/servo,mattnenterprise/servo,larsbergstrom/servo,emilio/servo,upsuper/servo,dati91/servo,fiji-flo/servo,CJ8664/servo,szeged/servo,CJ8664/servo,eddyb/servo,emilio/servo,nnethercote/servo,ConnorGBrewster/servo,CJ8664/servo,splav/servo,szeged/servo,dati91/servo,mbrubeck/servo,pyfisch/servo,splav/servo,anthgur/servo,saneyuki/servo,KiChjang/servo,szeged/servo,KiChjang/servo,larsbergstrom/servo,nnethercote/servo,mbrubeck/servo,rnestler/servo,canaltinova/servo,ConnorGBrewster/servo,anthgur/servo,avadacatavra/servo,rnestler/servo,jimberlage/servo,pyfisch/servo,KiChjang/servo,dsandeephegde/servo,canaltinova/servo,notriddle/servo,CJ8664/servo,notriddle/servo,saneyuki/servo,sadmansk/servo,jimberlage/servo,rnestler/servo,dsandeephegde/servo,cbrewster/servo,sadmansk/servo,pyfisch/servo,KiChjang/servo,pyfisch/servo,jimberlage/servo,peterjoel/servo,dati91/servo,nnethercote/servo,mattnenterprise/servo,cbrewster/servo,paulrouget/servo,larsbergstrom/servo,mbrubeck/servo,jimberlage/servo,peterjoel/servo,upsuper/servo,pyfisch/servo,dsandeephegde/servo,emilio/servo,CJ8664/servo,peterjoel/servo,dati91/servo,mbrubeck/servo,sadmansk/servo,sadmansk/servo,saneyuki/servo,dati91/servo,peterjoel/servo,SimonSapin/servo,szeged/servo,KiChjang/servo,notriddle/servo,pyfisch/servo,cbrewster/servo,larsbergstrom/servo,peterjoel/servo,emilio/servo,DominoTree/servo,anthgur/servo,thiagopnts/servo,SimonSapin/servo,saneyuki/servo,CJ8664/servo,upsuper/servo,nnethercote/servo,mattnenterprise/servo,nnethercote/servo,cbrewster/servo,rnestler/servo,jimberlage/servo,CJ8664/servo,saneyuki/servo,paulrouget/servo,thiagopnts/servo,upsuper/servo,dsandeephegde/servo,DominoTree/servo,paulrouget/servo,peterjoel/servo,fiji-flo/servo,notriddle/servo,avadacatavra/servo,thiagopnts/servo,splav/servo,canaltinova/servo,avadacatavra/servo,dsandeephegde/servo,dati91/servo,nnethercote/servo,eddyb/servo,mattnenterprise/servo,fiji-flo/servo,larsbergstrom/servo,jimberlage/servo,rnestler/servo,jimberlage/servo,ConnorGBrewster/servo,cbrewster/servo,eddyb/servo,rnestler/servo,thiagopnts/servo,splav/servo,larsbergstrom/servo,cbrewster/servo,sadmansk/servo,peterjoel/servo,SimonSapin/servo,eddyb/servo,saneyuki/servo,DominoTree/servo,fiji-flo/servo,notriddle/servo,notriddle/servo,rnestler/servo,eddyb/servo,eddyb/servo,DominoTree/servo,KiChjang/servo,szeged/servo,saneyuki/servo,splav/servo,ConnorGBrewster/servo,emilio/servo,avadacatavra/servo,larsbergstrom/servo,nnethercote/servo,thiagopnts/servo,pyfisch/servo,canaltinova/servo,eddyb/servo,CJ8664/servo,szeged/servo,upsuper/servo,thiagopnts/servo,saneyuki/servo,anthgur/servo,upsuper/servo,mattnenterprise/servo,pyfisch/servo,paulrouget/servo,DominoTree/servo,larsbergstrom/servo,splav/servo,fiji-flo/servo,splav/servo,paulrouget/servo,mbrubeck/servo,rnestler/servo,peterjoel/servo,avadacatavra/servo,cbrewster/servo,anthgur/servo,dati91/servo,notriddle/servo,notriddle/servo,canaltinova/servo,dsandeephegde/servo,thiagopnts/servo,SimonSapin/servo,mattnenterprise/servo,szeged/servo,emilio/servo,larsbergstrom/servo,SimonSapin/servo,ConnorGBrewster/servo,peterjoel/servo,anthgur/servo,splav/servo,fiji-flo/servo,fiji-flo/servo,KiChjang/servo,szeged/servo,avadacatavra/servo,emilio/servo,canaltinova/servo,upsuper/servo,saneyuki/servo,fiji-flo/servo,paulrouget/servo,SimonSapin/servo,anthgur/servo,DominoTree/servo,peterjoel/servo,dsandeephegde/servo,larsbergstrom/servo,mbrubeck/servo,ConnorGBrewster/servo,notriddle/servo,sadmansk/servo,jimberlage/servo,thiagopnts/servo,paulrouget/servo,cbrewster/servo,avadacatavra/servo,nnethercote/servo,anthgur/servo,jimberlage/servo,splav/servo,KiChjang/servo,canaltinova/servo,emilio/servo,DominoTree/servo,ConnorGBrewster/servo