Add basic brush stroke rasterization benchmark
Add basic brush stroke rasterization benchmark

Oletus/glbrush.js,garg/glbrush.js,Oletus/glbrush.js,Bercon/glbrush.js,garg/examplepressure,garg/examplepressure,Oletus/glbrush.js,Bercon/glbrush.js,garg/glbrush.js,garg/examplepressure,Bercon/glbrush.js,garg/glbrush.js,Bercon/glbrush.js,garg/examplepressure,garg/glbrush.js