float UnityWebRequest.downloadProgress 的返回值。
访问 UnityWebRequest.downloadProgress 时调用的回调。
当脚本访问此 DownloadHandler 的父 UnityWebRequest 上的 UnityWebRequest.downloadProgress 属性时，将调用此回调。此方法的返回值将作为 UnityWebRequest.downloadProgress 属性的值返回。
将在主线程中调用此回调。
如果不覆盖，此回调的默认行为是返回 0.5。
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