Lazily compute label sizes (#6351)
Lazily compute label sizes (#6351)

* Lazily compute label sizes

* Reduce file size

touletan/Chart.js,chartjs/Chart.js,touletan/Chart.js,touletan/Chart.js,nnnick/Chart.js,chartjs/Chart.js,touletan/Chart.js,chartjs/Chart.js,chartjs/Chart.js