script: Squash duplicate animation tick events in the queue.
script: Squash duplicate animation tick events in the queue.

This prevents them from piling up endlessly if the JS
`requestAnimationFrame()` callback takes a long time to complete.

upsuper/servo,dati91/servo,paulrouget/servo,szeged/servo,codemac/servo,kindersung/servo,thiagopnts/servo,akosel/servo,fiji-flo/servo,nnethercote/servo,ConnorGBrewster/servo,thiagopnts/servo,mattnenterprise/servo,jlegendary/servo,szeged/servo,wartman4404/servo,pyfisch/servo,vks/servo,nnethercote/servo,canaltinova/servo,CJ8664/servo,GyrosOfWar/servo,dsandeephegde/servo,nrc/servo,g-k/servo,dsandeephegde/servo,jimberlage/servo,caldwell/servo,vks/servo,SimonSapin/servo,rnestler/servo,AnthonyBroadCrawford/servo,youprofit/servo,cbrewster/servo,szeged/servo,GyrosOfWar/servo,aidanhs/servo,nerith/servo,jimberlage/servo,dvberkel/servo,tempbottle/servo,sadmansk/servo,zentner-kyle/servo,vks/servo,rentongzhang/servo,meh/servo,runarberg/servo,g-k/servo,mattnenterprise/servo,dsandeephegde/servo,eddyb/servo,SimonSapin/servo,saneyuki/servo,mbrubeck/servo,kindersung/servo,anthgur/servo,jlegendary/servo,CJ8664/servo,szeged/servo,DominoTree/servo,peterjoel/servo,larsbergstrom/servo,AnthonyBroadCrawford/servo,brendandahl/servo,avadacatavra/servo,dagnir/servo,meh/servo,jimberlage/servo,jdramani/servo,jdramani/servo,codemac/servo,aidanhs/servo,emilio/servo,SimonSapin/servo,mattnenterprise/servo,SimonSapin/servo,notriddle/servo,emilio/servo,AnthonyBroadCrawford/servo,peterjoel/servo,sadmansk/servo,j3parker/servo,paulrouget/servo,eddyb/servo,larsbergstrom/servo,vks/servo,rnestler/servo,sadmansk/servo,zentner-kyle/servo,kindersung/servo,rentongzhang/servo,DominoTree/servo,A-deLuna/servo,larsbergstrom/servo,brendandahl/servo,dvberkel/servo,kindersung/servo,tafia/servo,youprofit/servo,bjwbell/servo,caldwell/servo,youprofit/servo,splav/servo,splav/servo,tafia/servo,emilio/servo,jdramani/servo,j3parker/servo,AnthonyBroadCrawford/servo,pyfisch/servo,meh/servo,fiji-flo/servo,saratang/servo,mattnenterprise/servo,nick-thompson/servo,mbrubeck/servo,RenaudParis/servo,rentongzhang/servo,rnestler/servo,eddyb/servo,emilio/servo,meh/servo,wartman4404/servo,thiagopnts/servo,j3parker/servo,j3parker/servo,ConnorGBrewster/servo,tempbottle/servo,A-deLuna/servo,caldwell/servo,nick-thompson/servo,fiji-flo/servo,pyfisch/servo,CJ8664/servo,runarberg/servo,canaltinova/servo,emilio/servo,bjwbell/servo,huonw/servo,walac/servo,tafia/servo,s142857/servo,SimonSapin/servo,boghison/servo,canaltinova/servo,fiji-flo/servo,paulrouget/servo,walac/servo,upsuper/servo,huonw/servo,CJ8664/servo,SimonSapin/servo,saneyuki/servo,upsuper/servo,akosel/servo,saneyuki/servo,notriddle/servo,anthgur/servo,avadacatavra/servo,dhananjay92/servo,nick-thompson/servo,DominoTree/servo,KiChjang/servo,WriterOfAlicrow/servo,canaltinova/servo,mdibaiee/servo,nnethercote/servo,dati91/servo,dati91/servo,notriddle/servo,nick-thompson/servo,rentongzhang/servo,brendandahl/servo,wartman4404/servo,bjwbell/servo,sadmansk/servo,notriddle/servo,KiChjang/servo,A-deLuna/servo,tempbottle/servo,KiChjang/servo,tempbottle/servo,dhananjay92/servo,steveklabnik/servo,mdibaiee/servo,tempbottle/servo,DominoTree/servo,emilio/servo,upsuper/servo,walac/servo,saneyuki/servo,huonw/servo,peterjoel/servo,jdramani/servo,thiagopnts/servo,splav/servo,avadacatavra/servo,paulrouget/servo,dhananjay92/servo,dagnir/servo,canaltinova/servo,notriddle/servo,mattnenterprise/servo,aidanhs/servo,rentongzhang/servo,dati91/servo,nrc/servo,dvberkel/servo,AnthonyBroadCrawford/servo,nnethercote/servo,runarberg/servo,mdibaiee/servo,SimonSapin/servo,kindersung/servo,rnestler/servo,aidanhs/servo,brendandahl/servo,walac/servo,nerith/servo,cbrewster/servo,nerith/servo,steveklabnik/servo,thiagopnts/servo,dvberkel/servo,larsbergstrom/servo,bjwbell/servo,dati91/servo,thiagopnts/servo,dagnir/servo,canaltinova/servo,caldwell/servo,youprofit/servo,paulrouget/servo,saneyuki/servo,caldwell/servo,splav/servo,peterjoel/servo,tafia/servo,huonw/servo,A-deLuna/servo,mdibaiee/servo,nick-thompson/servo,saratang/servo,nrc/servo,nnethercote/servo,DominoTree/servo,eddyb/servo,GyrosOfWar/servo,rentongzhang/servo,RenaudParis/servo,dsandeephegde/servo,dvberkel/servo,steveklabnik/servo,RenaudParis/servo,larsbergstrom/servo,j3parker/servo,emilio/servo,ConnorGBrewster/servo,aidanhs/servo,saratang/servo,zentner-kyle/servo,g-k/servo,rentongzhang/servo,mdibaiee/servo,paulrouget/servo,vks/servo,caldwell/servo,codemac/servo,codemac/servo,peterjoel/servo,splav/servo,szeged/servo,DominoTree/servo,szeged/servo,KiChjang/servo,GyrosOfWar/servo,cbrewster/servo,youprofit/servo,CJ8664/servo,pyfisch/servo,RenaudParis/servo,larsbergstrom/servo,jlegendary/servo,nrc/servo,pyfisch/servo,wartman4404/servo,eddyb/servo,saratang/servo,saneyuki/servo,mbrubeck/servo,DominoTree/servo,paulrouget/servo,peterjoel/servo,huonw/servo,splav/servo,larsbergstrom/servo,dhananjay92/servo,szeged/servo,avadacatavra/servo,zentner-kyle/servo,sadmansk/servo,mattnenterprise/servo,anthgur/servo,codemac/servo,dagnir/servo,tafia/servo,jimberlage/servo,brendandahl/servo,eddyb/servo,g-k/servo,dsandeephegde/servo,upsuper/servo,akosel/servo,larsbergstrom/servo,notriddle/servo,nrc/servo,GyrosOfWar/servo,aidanhs/servo,akosel/servo,notriddle/servo,upsuper/servo,wartman4404/servo,mattnenterprise/servo,nnethercote/servo,jdramani/servo,wartman4404/servo,KiChjang/servo,ConnorGBrewster/servo,mbrubeck/servo,avadacatavra/servo,brendandahl/servo,s142857/servo,A-deLuna/servo,szeged/servo,walac/servo,upsuper/servo,pyfisch/servo,pyfisch/servo,eddyb/servo,boghison/servo,steveklabnik/servo,wartman4404/servo,bjwbell/servo,WriterOfAlicrow/servo,WriterOfAlicrow/servo,dhananjay92/servo,brendandahl/servo,splav/servo,nick-thompson/servo,mattnenterprise/servo,paulrouget/servo,nick-thompson/servo,KiChjang/servo,saneyuki/servo,bjwbell/servo,dsandeephegde/servo,boghison/servo,saratang/servo,rnestler/servo,DominoTree/servo,anthgur/servo,WriterOfAlicrow/servo,ConnorGBrewster/servo,j3parker/servo,nerith/servo,boghison/servo,nnethercote/servo,notriddle/servo,tafia/servo,steveklabnik/servo,larsbergstrom/servo,walac/servo,splav/servo,KiChjang/servo,canaltinova/servo,boghison/servo,eddyb/servo,dhananjay92/servo,mbrubeck/servo,AnthonyBroadCrawford/servo,peterjoel/servo,anthgur/servo,CJ8664/servo,nerith/servo,s142857/servo,boghison/servo,jlegendary/servo,jimberlage/servo,nnethercote/servo,splav/servo,zentner-kyle/servo,caldwell/servo,kindersung/servo,meh/servo,jimberlage/servo,g-k/servo,boghison/servo,larsbergstrom/servo,dsandeephegde/servo,CJ8664/servo,runarberg/servo,mbrubeck/servo,saratang/servo,aidanhs/servo,sadmansk/servo,jdramani/servo,jlegendary/servo,WriterOfAlicrow/servo,s142857/servo,youprofit/servo,jdramani/servo,dagnir/servo,tafia/servo,j3parker/servo,jlegendary/servo,vks/servo,CJ8664/servo,pyfisch/servo,cbrewster/servo,SimonSapin/servo,sadmansk/servo,codemac/servo,steveklabnik/servo,WriterOfAlicrow/servo,zentner-kyle/servo,dagnir/servo,saneyuki/servo,paulrouget/servo,peterjoel/servo,fiji-flo/servo,upsuper/servo,cbrewster/servo,runarberg/servo,notriddle/servo,dati91/servo,meh/servo,anthgur/servo,sadmansk/servo,huonw/servo,GyrosOfWar/servo,anthgur/servo,avadacatavra/servo,DominoTree/servo,A-deLuna/servo,rnestler/servo,walac/servo,dati91/servo,jimberlage/servo,steveklabnik/servo,nnethercote/servo,KiChjang/servo,canaltinova/servo,vks/servo,fiji-flo/servo,thiagopnts/servo,KiChjang/servo,s142857/servo,pyfisch/servo,kindersung/servo,avadacatavra/servo,GyrosOfWar/servo,saneyuki/servo,dvberkel/servo,peterjoel/servo,anthgur/servo,saratang/servo,mbrubeck/servo,jimberlage/servo,szeged/servo,RenaudParis/servo,rnestler/servo,RenaudParis/servo,DominoTree/servo,thiagopnts/servo,akosel/servo,tempbottle/servo,tempbottle/servo,dagnir/servo,avadacatavra/servo,dhananjay92/servo,nrc/servo,notriddle/servo,zentner-kyle/servo,rnestler/servo,nrc/servo,fiji-flo/servo,nerith/servo,WriterOfAlicrow/servo,cbrewster/servo,s142857/servo,saneyuki/servo,meh/servo,pyfisch/servo,mdibaiee/servo,runarberg/servo,emilio/servo,RenaudParis/servo,ConnorGBrewster/servo,mdibaiee/servo,cbrewster/servo,dati91/servo,mbrubeck/servo,cbrewster/servo,dsandeephegde/servo,splav/servo,s142857/servo,akosel/servo,ConnorGBrewster/servo,KiChjang/servo,nerith/servo,emilio/servo,g-k/servo,paulrouget/servo,g-k/servo,AnthonyBroadCrawford/servo,A-deLuna/servo,ConnorGBrewster/servo,nnethercote/servo,akosel/servo,bjwbell/servo,dvberkel/servo,peterjoel/servo,runarberg/servo,jimberlage/servo,codemac/servo,fiji-flo/servo,youprofit/servo,emilio/servo,jlegendary/servo,szeged/servo,huonw/servo