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        Reviewed by Darin Adler.

        [Windows] Fix a bug of round() with huge integral numbers
        https://bugs.webkit.org/show_bug.cgi?id=34297

        Fix a bug that round() for huge integral numbers returns incorrect
        results. For example, round(8639999913600001) returns
        8639999913600002 without this change though the double type can
        represent 8639999913600001 precisely.

        Math.round() of JavaScript has a similar problem. But this change
        doesn't fix it because Math.round() doesn't use round() of
        MathExtra.h.

        * wtf/MathExtras.h:
        (round): Avoid to do "num + 0.5" or "num - 0.5".
        (roundf): Fixed similarly.
        (llround): Calls round().
        (llroundf): Calls roundf().
        (lround): Calls round().
        (lroundf): Calls roundf().

2010-01-31  Kent Tamura  <tkent@chromium.org>

        Reviewed by Darin Adler.

        [Win] Fix a bug of round() with huge integral numbers
        https://bugs.webkit.org/show_bug.cgi?id=34297

        Add a test case to call round(8639999913600001).

        * fast/forms/input-valueasnumber-datetime-expected.txt:
        * fast/forms/script-tests/input-valueasnumber-datetime.js:

git-svn-id: svn://svn.chromium.org/blink/trunk@54121 bbb929c8-8fbe-4397-9dbb-9b2b20218538