dev/defs/animation/advanceable_state.json

{
  "name": "AdvanceableState",
  "key": {
    "int": 145,
    "string": "advanceablestate"
  },
  "abstract": true,
  "extends": "animation/layer_state.json",
  "properties": {
    "speed": {
      "type": "double",
      "initialValue": "1",
      "key": {
        "int": 292,
        "string": "speed"
      }
    }
  }
}