improve idle message loop #2385
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总体思路是放宽idle message的调用门槛，让worker message分散到更长的时间周期里返回给主线程，同时不会因为主线程忙而长时间堵塞worker消息的返回。 主要改进如下： * 改为按百分比设置worker向主线程返回的消息数量，解决繁忙时，worker中消息排队过久的问题 * busyLoop（animFrameLoop）返回更少消息：目前固定为idleLoop中返回比例的一半 * 实测发现workerPool.commit()对性能影响很小，broadcastIdleMessage改为每次loop都会执行。
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总体思路是放宽idle message的调用门槛，让worker message分散到更长的时间周期里返回给主线程，同时不会因为主线程忙而长时间堵塞worker消息的返回。
主要改进如下：