Roll engine 020222ddd021..4a55b4fd2500 (2 commits) (#49729)

https://github.com/flutter/engine/compare/020222ddd021...4a55b4fd2500

git log 020222ddd021..4a55b4fd2500 --first-parent --oneline
2020-01-29 abrush21@users.noreply.github.com Modifies accessibility bridge to populate new node fields in semantic… (flutter/engine#15116)
2020-01-29 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 2rLoq... to -mGIA... (flutter/engine#16195)


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 cbracken@google.com on the revert to ensure that a human
is aware of the problem.

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/+/master/autoroll/README.md

bin/internal/engine.version

-020222ddd0216a43a6b87e59a6bfcea392f70054
+4a55b4fd2500bf96de93c4feb4172d88b93d52c3