https://bugs.webkit.org/show_bug.cgi?id=42680

Reviewed by Gavin Barraclough.

WebKitTestRunner needs layoutTestController.addUserScript
https://bugs.webkit.org/show_bug.cgi?id=42681

WebKit2: 

Improve UserContent APIs to allow passing null in the same places
the WebKit1 API allowed. Add convenience function toWTFString to do
WKStringRef conversion with correct null string behavior.

* UIProcess/API/C/WKAPICast.h:
(toWTFString):
* WebProcess/InjectedBundle/API/c/WKBundle.cpp:
(WKBundleAddUserScript):
(WKBundleAddUserStyleSheet):
(WKBundleRemoveUserScript):
(WKBundleRemoveUserStyleSheet):
* WebProcess/InjectedBundle/InjectedBundle.cpp:
(WebKit::toStringVector):

WebKitTools: 

* WebKitTestRunner/InjectedBundle/Bindings/LayoutTestController.idl:
* WebKitTestRunner/InjectedBundle/InjectedBundle.cpp:
(WTR::InjectedBundle::beginTesting):
* WebKitTestRunner/InjectedBundle/LayoutTestController.cpp:
(WTR::LayoutTestController::addUserScript):
(WTR::LayoutTestController::addUserStyleSheet):
* WebKitTestRunner/InjectedBundle/LayoutTestController.h:

LayoutTests: 

* platform/mac-wk2/Skipped: Update skipped list.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@66548 268f45cc-cd09-0410-ab3c-d52691b4dbfc