Statistically significant A/B testing results should be color coded in details view

Statistically significant A/B testing results should be color coded in details view
https://bugs.webkit.org/show_bug.cgi?id=154414

Reviewed by Chris Dumez.

Color code the statistically significant comparisions in TestGroupResultsTable as done in the analysis
results viewer.

* public/v3/components/customizable-test-group-form.js:
(CustomizableTestGroupForm.cssTemplate): Build fix after r196768.
* public/v3/components/test-group-results-table.js:
(TestGroupResultsTable.prototype.buildRowGroups): Add the status as a class name.
(TestGroupResultsTable.cssTemplate): Added styles to color-code statistically significant results.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@196787 268f45cc-cd09-0410-ab3c-d52691b4dbfc