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        Reviewed by Adele Peterson.

        Do color animations on premultiplied colors
        https://bugs.webkit.org/show_bug.cgi?id=34383

        Convert colors to premultiplied alpha before interpolating them,
        then convert the result back to non-premultiplied. This gives better
        results when animating from transparent colors.

        Test: transitions/color-transition-premultiplied.html

        * page/animation/AnimationBase.cpp:
        (WebCore::blendFunc):

git-svn-id: svn://svn.chromium.org/blink/trunk@54106 bbb929c8-8fbe-4397-9dbb-9b2b20218538