Switch default `gulp visual-diff` mode to Puppeteer (#16541)
Switch default `gulp visual-diff` mode to Puppeteer (#16541)


jmadler/amphtml,jridgewell/amphtml,widespace-os/amphtml,src-code/amphtml,Gregable/amphtml,kamtschatka/amphtml,nexxtv/amphtml,ampproject/amphtml,zhouyx/amphtml,zhouyx/amphtml,jridgewell/amphtml,tlong2/amphtml,kamtschatka/amphtml,cvializ/amphtml,prateekbh/amphtml,kamtschatka/amphtml,lannka/amphtml,yieldbot/amphtml,rsimha-amp/amphtml,jpettitt/amphtml,honeybadgerdontcare/amphtml,taboola/amphtml,nexxtv/amphtml,koshka/amphtml,mhc-gh/amphtml,sharethrough/amphtml,koshka/amphtml,jpettitt/amphtml,taboola/amphtml,Gregable/amphtml,rsimha-amp/amphtml,danielrozenberg/amphtml,erwinmombay/amphtml,BenDz/amphtml,yandex-pcode/amphtml,koshka/amphtml,Gregable/amphtml,voyagegroup/amphtml,jmadler/amphtml,yandex-pcode/amphtml,lannka/amphtml,mhc-gh/amphtml,sebastianbenz/amphtml,yandex-pcode/amphtml,yieldbot/amphtml,taboola/amphtml,nexxtv/amphtml,sharethrough/amphtml,adup-tech/amphtml,kamtschatka/amphtml,tlong2/amphtml,cvializ/amphtml,tlong2/amphtml,chaveznvg/amphtml,danielrozenberg/amphtml,jpettitt/amphtml,tlong2/amphtml,cvializ/amphtml,dotandads/amphtml,adup-tech/amphtml,chaveznvg/amphtml,danielrozenberg/amphtml,pedjoni8/amphtml,techhtml/amphtml,media-net/amphtml,voyagegroup/amphtml,honeybadgerdontcare/amphtml,mhc-gh/amphtml,erwinmombay/amphtml,lannka/amphtml,alanorozco/amphtml,taboola/amphtml,src-code/amphtml,media-net/amphtml,cory-work/amphtml,danielrozenberg/amphtml,adup-tech/amphtml,prateekbh/amphtml,yieldbot/amphtml,taboola/amphtml,adup-tech/amphtml,voyagegroup/amphtml,tlong2/amphtml,BenDz/amphtml,lannka/amphtml,voyagegroup/amphtml,aghassemi/amphtml,ampproject/amphtml,zhangsu/amphtml,Gregable/amphtml,honeybadgerdontcare/amphtml,taboola/amphtml,zhouyx/amphtml,aghassemi/amphtml,voyagegroup/amphtml,cory-work/amphtml,widespace-os/amphtml,pedjoni8/amphtml,sharethrough/amphtml,yieldbot/amphtml,danielrozenberg/amphtml,tlong2/amphtml,zhangsu/amphtml,smartadserver/amphtml,laterpay/amphtml,erwinmombay/amphtml,danielrozenberg/amphtml,media-net/amphtml,kamtschatka/amphtml,rsimha-amp/amphtml,zhangsu/amphtml,yieldbot/amphtml,alanorozco/amphtml,sharethrough/amphtml,laterpay/amphtml,sharethrough/amphtml,yandex-pcode/amphtml,prateekbh/amphtml,media-net/amphtml,mhc-gh/amphtml,alanorozco/amphtml,rsimha-amp/amphtml,media-net/amphtml,cory-work/amphtml,prateekbh/amphtml,cvializ/amphtml,pedjoni8/amphtml,lannka/amphtml,jpettitt/amphtml,jmadler/amphtml,nexxtv/amphtml,dotandads/amphtml,jridgewell/amphtml,smartadserver/amphtml,alanorozco/amphtml,BenDz/amphtml,kamtschatka/amphtml,nexxtv/amphtml,src-code/amphtml,media-net/amphtml,widespace-os/amphtml,media-net/amphtml,erwinmombay/amphtml,honeybadgerdontcare/amphtml,lannka/amphtml,jmadler/amphtml,honeybadgerdontcare/amphtml,dotandads/amphtml,BenDz/amphtml,chaveznvg/amphtml,jridgewell/amphtml,Gregable/amphtml,lannka/amphtml,danielrozenberg/amphtml,jpettitt/amphtml,Gregable/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,dotandads/amphtml,widespace-os/amphtml,sebastianbenz/amphtml,sebastianbenz/amphtml,prateekbh/amphtml,widespace-os/amphtml,pedjoni8/amphtml,chaveznvg/amphtml,yieldbot/amphtml,pedjoni8/amphtml,koshka/amphtml,jpettitt/amphtml,nexxtv/amphtml,yandex-pcode/amphtml,ampproject/amphtml,mhc-gh/amphtml,ampproject/amphtml,techhtml/amphtml,yandex-pcode/amphtml,yandex-pcode/amphtml,zhouyx/amphtml,BenDz/amphtml,ampproject/amphtml,sebastianbenz/amphtml,smartadserver/amphtml,jridgewell/amphtml,alanorozco/amphtml,zhangsu/amphtml,smartadserver/amphtml,laterpay/amphtml,smartadserver/amphtml,voyagegroup/amphtml,laterpay/amphtml,ampproject/amphtml,sharethrough/amphtml,aghassemi/amphtml,chaveznvg/amphtml,zhouyx/amphtml,voyagegroup/amphtml,dotandads/amphtml,cory-work/amphtml,laterpay/amphtml,jridgewell/amphtml,src-code/amphtml,src-code/amphtml,honeybadgerdontcare/amphtml,cory-work/amphtml,src-code/amphtml,jmadler/amphtml,jpettitt/amphtml,techhtml/amphtml,alanorozco/amphtml,ampproject/amphtml,sebastianbenz/amphtml,zhangsu/amphtml,alanorozco/amphtml,widespace-os/amphtml,koshka/amphtml,zhouyx/amphtml,prateekbh/amphtml,ampproject/amphtml,rsimha-amp/amphtml,alanorozco/amphtml,laterpay/amphtml,danielrozenberg/amphtml,koshka/amphtml,erwinmombay/amphtml,cvializ/amphtml,Gregable/amphtml,mhc-gh/amphtml,aghassemi/amphtml,dotandads/amphtml,jpettitt/amphtml,prateekbh/amphtml,rsimha-amp/amphtml,zhouyx/amphtml,adup-tech/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,pedjoni8/amphtml,techhtml/amphtml,Gregable/amphtml,nexxtv/amphtml,cvializ/amphtml,aghassemi/amphtml,taboola/amphtml,cory-work/amphtml,techhtml/amphtml,sebastianbenz/amphtml,erwinmombay/amphtml,cory-work/amphtml,chaveznvg/amphtml,zhangsu/amphtml,jmadler/amphtml,aghassemi/amphtml,techhtml/amphtml,media-net/amphtml,jridgewell/amphtml,BenDz/amphtml,mhc-gh/amphtml,adup-tech/amphtml