PowerManagerService息屏控制
设备根据frameworks\base\packages\SettingsProvider\res\values\defaults.xml
<integer name="def_screen_off_timeout">60000</integer>
不进行操作60S后进入息屏状态，在每次更新系统power状态的时候，都要基于当前的user activity计算再次唤醒或者睡眠的时间。关键函数updateUserActivitySummaryLocked，主要是计算出下次超时时间nextTimeout和用户状态mUserActivitySummary，当满足nextTimeout<
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