2013-01-10  Igor Oliveira  <igor.o@sisa.samsung.com>

        ComputeContext::platformIDs and ComputeContext::deviceIDs do not return the CCerror, but instead of the number of platform/device ids
        Issue #62

        Reviewed by Antonio Gomes.

        Refactor ComputeContext::platformIDs and ComputeContext::deviceIDs to follow the same
        pattern as others ComputeContext methods.

        * Modules/webcl/WebCL.cpp:
        (WebCore::WebCL::createContext):
        * platform/ComputeContext.cpp:
        (WebCore::ComputeContext::platformIDs):
        (WebCore::ComputeContext::deviceIDs):
        * platform/ComputeContext.h: