Scenarios UI test PlatformViewMutationOpacityTests testPlatformView is flaky #69361
Description
In the past two days it has failed on ~6 commits. E.g.: https://ci.chromium.org/p/flutter/builders/prod/Mac%20iOS%20Engine/7509
t = 4.53s Assertion Failure: GoldenPlatformViewTests.m:72: failed - Goldens to not match. Follow the steps in the README to update golden named golden_platform_view_opacity_iPhone 8_simulator if needed.
t = 4.53s Tear Down
Test Case '-[PlatformViewMutationOpacityTests testPlatformView]' failed (4.535 seconds).
Test Suite 'PlatformViewMutationOpacityTests' failed at 2020-10-29 19:19:44.991.
There was an uptick in the frequency of this flake shortly after the Skia roll here flutter/engine#22140, but I have no idea if that is relevant.