Added Canvas toBlob polyfill
Added Canvas toBlob polyfill

abbychau/PaintsChainer,pfnet/PaintsChainer,abbychau/PaintsChainer,Tedko/PaintsChainer,Tedko/PaintsChainer,pfnet/PaintsChainer,abbychau/PaintsChainer,pfnet/PaintsChainer,Tedko/PaintsChainer