2013-08-06  Afonso R. Costa Jr.  <afonso.costa@samsung.com>

        Update the Layout Test which tests all devices using a single context
        Issue #81

        Reviewed by: Andre Loureiro
                     Diego Pinheiro
                     Marcelo Morais

        WebCLProxy create a context for each device. So, this test can't use
        it, because the main objective is to test all devices in a single
        context.
        Also, this commit removes some dead code, it uses WebCLTestUtils
        to create the random input data and it sets the correct value for
        localWorkSize parameter (according to each device).

        * webcl/tests/webcl-test-devices-sharing-single-context.html: