2013-02-11  Sharath Kamath  <kamath.sharath@gmail.com>

        ComputeContextCL::computeMemoryTypeToCL doesnt handle HOST_PTR flags.
        Issue #104

        Reviewed by Antonio.

        Need to add support to CL_MEM_USE_HOST_PTR, CL_MEM_ALLOC_HOST_PTR, CL_MEM_COPY_HOST_PTR flags.
        Gives a INVALID_HOST_POINTER with createImage API when a Image element is passes as i/p.

        No new tests.

        * platform/ComputeContext.h:
        * platform/opencl/ComputeContextCL.cpp:
        (WebCore::computeMemoryTypeToCL):