Web Inspector: CSS Pretty Printing fails to put space between rgb(...) and numbers...

Web Inspector: CSS Pretty Printing fails to put space between rgb(...) and numbers in minified gradients
https://bugs.webkit.org/show_bug.cgi?id=137414

Reviewed by Timothy Hatcher.

Add whitespace between rgb(...) and a number, possible in gradient
syntax like "linear-gradient(rgb(...)0%,rgb(...)100%)".

* Tools/PrettyPrinting/CodeMirrorFormatters.js:
* Tools/PrettyPrinting/css-tests/gradient-expected.css: Added.
(.dot-nav:nth-child(1n) li a.active):
* Tools/PrettyPrinting/css-tests/gradient.css: Added.
(.dot-nav:nth-child(1n) li a.active):
* Tools/PrettyPrinting/index.html:
* UserInterface/Views/CodeMirrorFormatters.js:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@174483 268f45cc-cd09-0410-ab3c-d52691b4dbfc