nathanrogersgoogle 69a16cbb01 Don't call OnAnimatorNotifyIdle if a frame is scheduled (flutter/engine#7746)
If a frame is scheduled by the time the delayed animator notify idle
task runs, then we should not call |NotifyIdle|.

Also, add a trace event in the task, to make it more clear in traces
when a notify idle call is coming from here (as opposed to
|Animator::AwaitVSync|).
2019-02-08 15:14:06 -08:00
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