style: Have TextAlign derive ToCss and unship char value from it.
style: Have TextAlign derive ToCss and unship char value from it.

Bug: 1434130
Reviewed-by: emilio
MozReview-Commit-ID: CXDnyqzjQkq

peterjoel/servo,dati91/servo,pyfisch/servo,paulrouget/servo,emilio/servo,szeged/servo,saneyuki/servo,pyfisch/servo,mbrubeck/servo,splav/servo,avadacatavra/servo,splav/servo,jimberlage/servo,canaltinova/servo,cbrewster/servo,jimberlage/servo,jimberlage/servo,emilio/servo,DominoTree/servo,canaltinova/servo,notriddle/servo,szeged/servo,saneyuki/servo,paulrouget/servo,DominoTree/servo,jimberlage/servo,pyfisch/servo,peterjoel/servo,sadmansk/servo,peterjoel/servo,cbrewster/servo,cbrewster/servo,nnethercote/servo,KiChjang/servo,ConnorGBrewster/servo,nnethercote/servo,KiChjang/servo,larsbergstrom/servo,nnethercote/servo,sadmansk/servo,jimberlage/servo,szeged/servo,KiChjang/servo,pyfisch/servo,mbrubeck/servo,nnethercote/servo,saneyuki/servo,paulrouget/servo,DominoTree/servo,splav/servo,dati91/servo,SimonSapin/servo,SimonSapin/servo,splav/servo,paulrouget/servo,szeged/servo,larsbergstrom/servo,pyfisch/servo,jimberlage/servo,notriddle/servo,pyfisch/servo,KiChjang/servo,sadmansk/servo,sadmansk/servo,saneyuki/servo,notriddle/servo,DominoTree/servo,peterjoel/servo,mbrubeck/servo,saneyuki/servo,notriddle/servo,dati91/servo,szeged/servo,paulrouget/servo,larsbergstrom/servo,nnethercote/servo,splav/servo,SimonSapin/servo,emilio/servo,nnethercote/servo,DominoTree/servo,ConnorGBrewster/servo,notriddle/servo,emilio/servo,saneyuki/servo,notriddle/servo,sadmansk/servo,canaltinova/servo,mbrubeck/servo,ConnorGBrewster/servo,emilio/servo,paulrouget/servo,cbrewster/servo,SimonSapin/servo,saneyuki/servo,pyfisch/servo,paulrouget/servo,larsbergstrom/servo,larsbergstrom/servo,emilio/servo,ConnorGBrewster/servo,mbrubeck/servo,dati91/servo,canaltinova/servo,KiChjang/servo,ConnorGBrewster/servo,peterjoel/servo,mbrubeck/servo,paulrouget/servo,sadmansk/servo,jimberlage/servo,KiChjang/servo,szeged/servo,jimberlage/servo,larsbergstrom/servo,canaltinova/servo,ConnorGBrewster/servo,peterjoel/servo,saneyuki/servo,avadacatavra/servo,avadacatavra/servo,szeged/servo,mbrubeck/servo,emilio/servo,splav/servo,nnethercote/servo,pyfisch/servo,KiChjang/servo,cbrewster/servo,splav/servo,avadacatavra/servo,DominoTree/servo,DominoTree/servo,ConnorGBrewster/servo,dati91/servo,szeged/servo,emilio/servo,notriddle/servo,larsbergstrom/servo,mbrubeck/servo,DominoTree/servo,jimberlage/servo,KiChjang/servo,saneyuki/servo,splav/servo,canaltinova/servo,peterjoel/servo,notriddle/servo,dati91/servo,dati91/servo,saneyuki/servo,paulrouget/servo,SimonSapin/servo,avadacatavra/servo,peterjoel/servo,SimonSapin/servo,peterjoel/servo,emilio/servo,avadacatavra/servo,ConnorGBrewster/servo,SimonSapin/servo,larsbergstrom/servo,avadacatavra/servo,szeged/servo,pyfisch/servo,DominoTree/servo,cbrewster/servo,canaltinova/servo,notriddle/servo,notriddle/servo,splav/servo,pyfisch/servo,KiChjang/servo,larsbergstrom/servo,larsbergstrom/servo,nnethercote/servo,DominoTree/servo,SimonSapin/servo,nnethercote/servo,splav/servo,emilio/servo,canaltinova/servo,szeged/servo,sadmansk/servo,KiChjang/servo,peterjoel/servo,paulrouget/servo,sadmansk/servo,cbrewster/servo,cbrewster/servo,dati91/servo,nnethercote/servo,avadacatavra/servo