2013-08-01  Afonso R. Costa Jr.  <afonso.costa@samsung.com>

        Add a LayoutTest for creating a WebCLContext without some WebCLContextProperties
        Issue #84.

        Reviewed by: Diego Pinheiro
                     Andre Loureiro

        According to WD, if WebCLPlatform and WebCLDevice are null in
        WebCLContextProperties, the implementation will decide which
        platform and devices to use, i.e., a WebCLPlatform and
        WebCLDevice objects will be created.

        * webcl/tests/webcl-test-context-properties-expected.txt: Added.
        * webcl/tests/webcl-test-context-properties.html: Added.