liyuqian e77237d6d3
Reland "Fix the first frame logic in tracing and driver (#35297)" (#37192)
This relands https://github.com/flutter/flutter/pull/35297

The followings have been done to fix the broken tests:
  1. Add `didSendFirstFrameRasterizedEvent` extension and its tests
  2. Wait for `didSendFirstFrameRasterizedEvent` instead of
     `didSendFirstFrameEvent` during start up tests
  3. Mark missed (probably newly added) start up tests as flaky
2019-07-31 11:01:52 -07:00
..

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