Reviewed by Darin Adler.

        CG implementation needed for compression quality in canvas.toDataURL
        https://bugs.webkit.org/show_bug.cgi?id=38492

        * platform/mac/Skipped:
2010-06-04  Matthew Delaney  <mdelaney@apple.com>

        Reviewed by Darin Adler.

        CG implementation needed for compression quality in canvas.toDataURL
        https://bugs.webkit.org/show_bug.cgi?id=38492

        Took toDataURL.jpeg.quality.basic.html test off of Skipped list. Passes.

        Went the route of avoiding in-band signaling to flag the use of a quality
        parameter or not. So, instead of simply passing the quality down as a
        double, instead I pass a reference to the quality parameter from where
        it comes in just after the JS bindings. Thus, no need for any global
        constants to signify when the quality is not specified. Updated the other
        platforms to support this (qt was on the only one currently with any
        implementation).

        * bindings/js/JSHTMLCanvasElementCustom.cpp: Moved range check logic for quality parameter down lower. Updated
        call to toDataURL to use double* instead of just passing the quality directly.
        (WebCore::JSHTMLCanvasElement::toDataURL):
        * bindings/v8/custom/V8HTMLCanvasElementCustom.cpp: Updated toDataURL call to pass double*
        (WebCore::V8HTMLCanvasElement::toDataURLCallback):
        * dom/CanvasSurface.cpp: Updated method prototype.
        (WebCore::CanvasSurface::toDataURL):
        * dom/CanvasSurface.h: Updated method prototype.
        (WebCore::CanvasSurface::toDataURL):
        * platform/graphics/ImageBuffer.h: Updated method signature to use double* for quality param.
        * platform/graphics/cairo/ImageBufferCairo.cpp: Updated prototype for consistency.
        (WebCore::ImageBuffer::toDataURL):
        * platform/graphics/cg/ImageBufferCG.cpp: Implemented support for quality parametejr when jpeg MIME type used.
        (WebCore::jpegUTI):
        (WebCore::utiFromMIMEType):
        (WebCore::ImageBuffer::toDataURL):
        * platform/graphics/haiku/ImageBufferHaiku.cpp: Updated prototype for consistency.
        (WebCore::ImageBuffer::toDataURL):
        * platform/graphics/qt/ImageBufferQt.cpp: Updated prototype for consistency.
        (WebCore::ImageBuffer::toDataURL):
        * platform/graphics/skia/ImageBufferSkia.cpp: Updated prototype for consistency.
        (WebCore::ImageBuffer::toDataURL):
        * platform/graphics/wince/ImageBufferWince.cpp: Updated prototype for consistency.
        (WebCore::ImageBuffer::toDataURL):
        * platform/graphics/wx/ImageBufferWx.cpp: Updated prototype for consistency.
        (WebCore::ImageBuffer::toDataURL):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60675 268f45cc-cd09-0410-ab3c-d52691b4dbfc