Roll Flutter Engine from ef2cf86c35a5 to 0ac8215c70ae (2 revisions) (#141464)

https://github.com/flutter/engine/compare/ef2cf86c35a5...0ac8215c70ae

2024-01-12 68449066+zijiehe-google-com@users.noreply.github.com [Fuchsia] Use chromium test-scripts to download images and execute tests (flutter/engine#49650)
2024-01-12 skia-flutter-autoroll@skia.org Roll Skia from e04ca400c5d8 to 2bc5d2ee9896 (1 revision) (flutter/engine#49761)

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 bdero@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://issues.skia.org/issues/new?component=1389291&template=1850622

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

bin/internal/engine.version

-ef2cf86c35a5c97771beb035f16f54af7acdb224
+0ac8215c70aeb1e406ca33927ac77835e4f1e9bc