Chrome devtools extension to test and debug the Querypoint Debugger, the qpp devtools extension,
and the devtoolsExtended Chrome Extension.

See https://github.com/google/qpp/wiki/Using-testRunner-and-the-nodejs-test-server

This extension can also be used to run Chrome devtools LayoutTests, 
for use by developers of Chrome devtools.  Many of the WebInspector LayoutTests will run 
under testRunner and they can be debugged.