Added test for downsize of image in 2 DPR env with request via %.
Added test for downsize of image in 2 DPR env with request via %.

alanwsmith/doc-write-image-loader,alanwsmith/doc-write-image-loader,alanwsmith/doc-write-image-loader,alanwsmith/document.write-image-loader,alanwsmith/document.write-image-loader