Problem/Motivation
Over in #2232861: Create BrowserTestBase for web-testing on top of Mink we got step one in, BrowserTestBase.
Now on with step 2 - adding a JavaScript driver.
Proposed resolution
* Use a phantomjs mink driver
* Let people install phantomjs on their server, its a tool like mysql/php
* Use the mink driver in a JavascriptTestBase
* Add a simple test: toolbar
Remaining tasks
* Motivate the testbot team to look at #2580007: Add phantomjs2 to the testrunners
* Review this issue
* profit
User interface changes
None
API changes
New base class for JavaScript testing