OffscreenCanvas — Speed up Your Canvas Operations with a Web Worker
OffscreenCanvasAPI is available as of Chrome 69. This article explains how you can use it to achieve performance improvements in rendering graphics in your web app.
Canvas toBlob() Support Added in Chrome 50
Support for canvas.toBlob set to land in Chrome 50.
Chrome Supports createImageBitmap() in Chrome 50
Support for image decoding in workers set to land in Chrome 50.