The test test/engine/view_embedder/dimensions_provider/custom_element_dimensions_provider_test.dart is flaky, timing out or getting the wrong values.

Looking at the build history, it has failed a few different times: https://ci.chromium.org/p/flutter/builders/prod/Linux%20Web%20Engine?limit=200

One particular example: https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20Production%20Engine%20Drone/39477/overview

In the test it seems like we wait 100 ms between these events to avoid them being coalesced, but it seems like that's not 100% reliable, and the events do get debounced by the browser sometimes.