Reviewed by Dave Hyatt

        https://bugs.webkit.org/show_bug.cgi?id=20328
        Fix a problem when an 'all' transition transition with more than
        one property changing is interrupted, and did some AnimationController
        cleanup.

        Test: transitions/interrupted-all-transition.html

        * page/AnimationController.cpp:
        (WebCore::ImplicitAnimation::ImplicitAnimation):
        (WebCore::AnimationControllerPrivate::blendProperties):
        (WebCore::CompositeAnimation::updateTransitions):
        (WebCore::CompositeAnimation::cleanupFinishedAnimations):
        (WebCore::CompositeAnimation::setTransitionStartTime):
        (WebCore::CompositeAnimation::overrideImplicitAnimations):
        (WebCore::CompositeAnimation::resumeOverriddenImplicitAnimations):
        (WebCore::ImplicitAnimation::animate):
        (WebCore::ImplicitAnimation::onAnimationEnd):
        (WebCore::ImplicitAnimation::sendTransitionEvent):
        (WebCore::ImplicitAnimation::affectsProperty):
        (WebCore::KeyframeAnimation::endAnimation):
        (WebCore::KeyframeAnimation::onAnimationEnd):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@35672 268f45cc-cd09-0410-ab3c-d52691b4dbfc