Function resolve_animation_specs 

pub fn resolve_animation_specs(
    name: Option<&str>,
    duration: Option<&str>,
    timing: Option<&str>,
    delay: Option<&str>,
    iteration_count: Option<&str>,
    direction: Option<&str>,
    fill_mode: Option<&str>,
    play_state: Option<&str>,
) -> Vec<AnimationSpec>

W3C CSS Animations Level 1 §4: 個別ロングハンド群（animation-name, animation-duration, animation-timing-function, animation-delay, animation-iteration-count, animation-direction, animation-fill-mode, animation-play-state）から Vec<AnimationSpec> を合成・解決する。