[2dcontext-tests] Add new ImageBitmapRenderingContext tests (#4167)

The specs for ImageBitmapRenderingContext is here:
https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context

This pull request adds some tests to make sure spec compliance.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4167

Received on Thursday, 3 November 2016 17:51:34 UTC