Bug 1364862: Make PostRebuildAllStyleData async. r=heycam
Bug 1364862: Make PostRebuildAllStyleData async. r=heycam

MozReview-Commit-ID: EM3eUP1dWwA
Signed-off-by: Emilio Cobos Álvarez <86fa523305b8ad6a8a853c04cfef24a0445908d3@crisal.io>

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