style: Make SMIL values not roundtrip through strings.
style: Make SMIL values not roundtrip through strings.

Bug: 1458814
Reviewed-by: hiro
MozReview-Commit-ID: DpbFSutIv3t

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