Jackson Gardner ed2ceeb022 Implement frame timing callbacks in Skwasm. (flutter/engine#50737)
Fixes https://github.com/flutter/flutter/issues/140429

Some notes here:
* Refactored the frame timing systems so that we can deal with asynchronous rendering.
* Consolidated rendering of multiple pictures in skwasm into a single call, so that the rasterization can be properly measured.
* Pulled the frame timings tests into the `ui` test suite so that they run on all renderers (including skwasm).
2024-02-22 19:52:44 +00:00
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