2014-04-04  Sharath Kamath  <s.kamath@samsung.com>

        Exceptions with uninitialized event.

        Issue #508

        Reviewed by Antonio.

        [https://www.khronos.org/bugzilla/show_bug.cgi?id=1113] states sending a
        uninitialized event or calling getInfo on uninitialized event, must throw
        INVALID_EVENT.

        GetInfo & GetProfilingInfo test cases in conformance test suite.

        * Modules/webcl/WebCLEvent.cpp:
        (WebCore::WebCLEvent::getInfo):
        (WebCore::WebCLEvent::getProfilingInfo):