196bd4165f
I broke this in https://github.com/flutter/engine/pull/49543 While investigating https://github.com/flutter/flutter/issues/141235 I realized that the specific things that were wrong there were probably artifacts of some intermediate issue in the previous patch - they no longer appear. However, I had broken hot reload. This patch fixes it and updates the `EntityTest.RuntimeEffect` to artificially run the rendering callback a few times simulating a hot reload. The test fails without my changes here.