Re: Add a CSS test for radial gradients. (#5647)

This PR replaces #5645. It uses the correct folder.

@jdm I can see no difference between the two files in Chrome  58.0.3029.81. But if I use capture screenshot from the developer tools fine white lines appear between the different divs.

![css-images-3-gradients-with-border html](https://cloud.githubusercontent.com/assets/2781017/25313875/756a0c02-2838-11e7-9e13-9251d8bb5287.png)
![css-images-3-gradients-with-border-ref html](https://cloud.githubusercontent.com/assets/2781017/25313874/75602070-2838-11e7-8009-afeee7c85fad.png)

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5647#issuecomment-296442925

Received on Sunday, 23 April 2017 13:22:31 UTC