[EFL] LayoutTestController needs implementation of addUserStyleSheet

[EFL] LayoutTestController needs implementation of addUserStyleSheet
https://bugs.webkit.org/show_bug.cgi?id=82446

Source/WebKit/efl:

Add missing implementation addUserStyleSheet to EFL's
DumpRenderTreeSupport.

Patch by Sudarsana Nagineni <sudarsana.nagineni@linux.intel.com> on 2012-04-10
Reviewed by Antonio Gomes.

* WebCoreSupport/DumpRenderTreeSupportEfl.cpp:
(DumpRenderTreeSupportEfl::addUserStyleSheet):
* WebCoreSupport/DumpRenderTreeSupportEfl.h:

Tools:

Adding missing implementation addUserStyleSheet to EFL's LayoutTestController
so that we can unskip related tests from the skip list.

Patch by Sudarsana Nagineni <sudarsana.nagineni@linux.intel.com> on 2012-04-10
Reviewed by Antonio Gomes.

* DumpRenderTree/efl/LayoutTestControllerEfl.cpp:
(LayoutTestController::addUserStyleSheet): Implemented.

LayoutTests:

Unskipping the following test cases:
userscripts/mixed-case-stylesheet.html
userscripts/user-style-all-frames.html
userscripts/simple-stylesheet.html
userscripts/script-run-at-end.html

Patch by Sudarsana Nagineni <sudarsana.nagineni@linux.intel.com> on 2012-04-10
Reviewed by Antonio Gomes.

* platform/efl/Skipped:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113719 268f45cc-cd09-0410-ab3c-d52691b4dbfc