liyuqian 09d418b080 Revert "[tracing] SceneDisplayLag is a synchronous event (#17878)" (flutter/engine#17916)
This reverts commit ca5cc907a90ee4e0dffd712f7fa1f2142813220e.

Reverts flutter/engine#17878

This breaks our devicelab tests.

TBR: @flar
2020-04-23 18:04:39 -07:00
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