Description

While enabling thread merging on Android, I discovered a bug that was causing the app to render frames very slowly. It turns PostDelayedTask was causing the loop to be waken up too late, and therefore causing a lot of visual jank.

Related Issues

flutter/flutter#63585

Tests

I added the following tests: Unit tests

Checklist

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• I read the contributor guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the C++, Objective-C, Java style guides for the engine.
• I read the tree hygiene wiki page, which explains my responsibilities.
• I updated/added relevant documentation.
• All existing and new tests are passing.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

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• No, no existing tests failed, so this is not a breaking change.
• Yes, this is a breaking change. If not, delete the remainder of this section.
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  • I got input from the developer relations team, specifically from: Replace with the names of who gave advice
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