f001ea29f adding windows platform to felt. fixing signal (flutter/engine#15111) (#48422)

https://github.com/flutter/engine/compare/4e9e69d2b392...f001ea29f1b9

git log 4e9e69d2b392..f001ea29f1b9 --first-parent --oneline
2020-01-08 nurhan@google.com adding windows platform to felt. fixing signal (flutter/engine#15111)


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 garyq@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

-4e9e69d2b3920832da47d667ffcf1c402e25c96a
+f001ea29f1b9664d928acfddbbd9c76a942e2238