Roll Flutter Engine from b7fced37086b to 3ef9adec406d (1 revision) (#127917)

https://github.com/flutter/engine/compare/b7fced37086b...3ef9adec406d

2023-05-31 skia-flutter-autoroll@skia.org Roll Skia from 6920730bc2e8 to 6c27b245a173 (1 revision) (flutter/engine#42443)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC jonahwilliams@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/engine.version

-b7fced37086bf4794f7b8d970c5e8836054c90b2
+3ef9adec406d5dad49d38a1f3cd87469244febf4