adding-HA-hack-to-all-children.css

.scrolling-element-class * {
    -webkit-transform: translate3d(0,0,0);
}

adding-overthrow.css

.overthrow-enabled .overthrow {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

webkit-native-scrolling-with-HA-hack.css

.scrolling-element-class {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

.scrolling-element-class .child-element {
    position: relative;
    -webkit-transform: translate3d(0,0,0);
}

webkit-native-scrolling.css

.scrolling-element {
    overflow: auto; /* or overflow: scroll, if that's your thing */
    -webkit-overflow-scrolling: touch;
}