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This is a reland of the previous PR, now that the blocking Dart SDK issue has been fixed (see https://github.com/dart-lang/sdk/issues/54991). Also, I addressed an issue where the timings were incorrect due to different time origins on the main thread and web worker. The timings should be accurate now. Notes from the original PR are as follows: 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).