2013-10-27  Shilpa Shri  <shilpa.shri@samsung.com>

        Add implementation to verify for exception MEM_COPY_OVERLAP

        Issue #326

        Reviewed by NOBODY (OOPS!).

        Conformance files :
        conformance/buffimgs/cl_commandQueue_enqueueCopyImage.html
        conformance/buffimgs/cl_commandQueue_enqueueCopyBuffer.html
        conformance/buffimgs/cl_commandQueue_enqueueCopyBufferRect.html

        * Modules/webcl/WebCLCommandQueue.cpp:
        (WebCore::WebCLCommandQueue::enqueueCopyImage):
        (WebCore::WebCLCommandQueue::enqueueCopyBuffer):
        (WebCore::WebCLCommandQueue::enqueueCopyBufferRect):