2013-10-22  Shilpa Shri  <shilpa.shri@samsung.com>

        Adding and modifying implementation to verify exceptions to the APIs
        WebCLContext :: createSampler and WebCLContext :: createProgram, as per the updated spec.

        Issue #322

        Reviewed by Sharath Kamath.

        Conformance test cases it affects :
        conformance/basicoperations/cl_context_createSampler.html
        conformance/basicoperations/cl_context_createProgram.html
        [https://github.com/SRA-SiliconValley/webkit-webcl-conformance]

        * Modules/webcl/WebCLContext.cpp:
        (WebCore::WebCLContext::createProgram):
        (WebCore::WebCLContext::createSampler):
        * Modules/webcl/WebCLInputChecker.cpp:
        (WebCore::WebCLInputChecker::isValidAddressingMode):