ready method
void
ready()
Implementation
void ready() {
readyFrameCount = FrameUtil.frameCount;
mtLog("$debugIdentify - 完成前后: 前:$initFrameCount, 后:$readyFrameCount $debugPhase",tag: TagsConfig.tagSyncAutoFrame);
_debugAssertReadyPhase();
assert(state == TaskState.init);
state = TaskState.readyToComplete;
manager.addMicroTask(this);
}