2013-08-30  Antonio Gomes  <a1.gomes@sisa.samsung.com>

        WebCLGLContext::getInfo needs implementation
        Issue #274

        Reviewed by Igor.

        Implemented WebCLGLContext::getInfo(CONTEXT_PROPERTIES)
        in terms of its base class' method (WebCLContext).

        When we realize that the returned value is GL-capable,
        cast it to returned the expected value.

        * Modules/webcl/WebCLContextProperties.h:
        (WebCore::WebCLContextProperties::isGLCapable):
        * Modules/webcl/WebCLGLContext.idl:
        * Modules/webcl/WebCLGLContextProperties.h:
        (WebCore::WebCLGLContextProperties::isGLCapable):
        * Modules/webcl/WebCLGLContextProperties.idl:
        * bindings/js/JSWebCLCustom.cpp:
        (WebCore::toJS):