Return whether the root element has animation-only dirty bit from Servo_TraverseSubtree for flushing throttled animations.
Return whether the root element has animation-only dirty bit from Servo_TraverseSubtree for flushing throttled animations.

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