2014-02-14  Sharath Kamath  <s.kamath@samsung.com>

        Simplify handing of HTML video/image/canvas content.

        Fixed #18

        Reviewed by Antonio.

        GC3D::packImageData() can be reused to unpack a HTMLImage &
        HTMLCanvas and extract the data from it.
        Using graphics/GraphicsContext3D fucntion in ComputeContext.

        All test cases wrt HTMLImage & HTMLCanvas in extension folder.

        * Modules/webcl/WebCLHTMLInterop.cpp:
        (WebCore::WebCLHTMLInterop::extractDataFromCanvas):
        (WebCore::WebCLHTMLInterop::extractDataFromImage):
        * platform/ComputeContext.h:
        * platform/opencl/ComputeContextCL.cpp:
        (WebCore::ComputeContext::CCPackImageData):