2013-03-07  Sharath Kamath  <kamath.sharath@gmail.com>

        kernel.setArg doesnt not support LOCAL_MEM_SIZE.
        Issue #118

        Reviewed by NOBODY (OOPS!).

        LOCAL_MEM_SIZE is used to create a __local paramater in OpenCL kernel.
        This needs to be supported by WebCL.

        Adding support to LOCAL_MEM_SIZE in ComputeContext.h & also a switch case
        in setArg().

        No new tests (OOPS!).

        * Modules/webcl/WebCLKernel.cpp:
        (WebCore::WebCLKernel::setArg):
        * platform/ComputeContext.h: