Roll Flutter Engine from 820645dbcc69 to b3c8597df0e2 (5 revisions) (#141175)

https://github.com/flutter/engine/compare/820645dbcc69...b3c8597df0e2

2024-01-09 skia-flutter-autoroll@skia.org Roll Skia from 665f7d51ef25 to f9f73082740e (1 revision) (flutter/engine#49630)
2024-01-09 skia-flutter-autoroll@skia.org Roll Skia from 360944e3175f to 665f7d51ef25 (2 revisions) (flutter/engine#49628)
2024-01-09 skia-flutter-autoroll@skia.org Roll Skia from 92b84715ba73 to 360944e3175f (2 revisions) (flutter/engine#49622)
2024-01-09 skia-flutter-autoroll@skia.org Roll Skia from 06404ed554e7 to 92b84715ba73 (1 revision) (flutter/engine#49620)
2024-01-09 skia-flutter-autoroll@skia.org Roll Dart SDK from e8aa66f435ae to 721fccffc708 (5 revisions) (flutter/engine#49616)

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

-820645dbcc6951da0a142fc12683f01aa95651d0
+b3c8597df0e2d4e21f4f78656a5aca60d36906d5