function animationPlayersCallback(animationPlayers)
        {
            this._animationProperties = {};
            if (!animationPlayers)
                return;
            for (var i = 0; i < animationPlayers.length; i++) {
                var player = animationPlayers[i];
                if (!player.source().keyframesRule())
                    continue;
                var animationCascade = new WebInspector.SectionCascade();
                var keyframes = player.source().keyframesRule().keyframes();
                for (var j = 0; j < keyframes.length; j++)
                    animationCascade.appendModelFromStyle(keyframes[j].style(), "");
                for (var property of animationCascade.allUsedProperties())
                    this._animationProperties[property] = player.name();
            }
        }
@param {?Array.<!WebInspector.AnimationModel.AnimationPlayer>} animationPlayers
@this {WebInspector.StylesSidebarPane}