2010-06-25 Dean Jackson <dino@apple.com>

        Reviewed by Simon Fraser.

        https://bugs.webkit.org/show_bug.cgi?id=41188
        Animations should not require 0% and 100% keyframes

        When we are generating the animation lists in CSSStyleSelector,
        rather than bail if we notice that "from" or "to" are missing, we
        now generate synthetic keyframes for those cases.

        Tests: animations/missing-from-to-transforms.html
               animations/missing-from-to.html
               WebCore/manual-tests/animation-with-transition.html

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::styleForKeyframe):
                Moved individual keyframe generation into a new function.
        (WebCore::CSSStyleSelector::keyframeStylesForAnimation):
                Call the new function above for regular keyframes, and
                also check for missing keyframes and generate them if
                necessary.
        * css/CSSStyleSelector.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@61933 268f45cc-cd09-0410-ab3c-d52691b4dbfc