Roll engine 82a851cf21cf..ddaa9dc95f7b (2 commits) (#48852)

https://github.com/flutter/engine/compare/82a851cf21cf...ddaa9dc95f7b

git log 82a851cf21cf..ddaa9dc95f7b --first-parent --oneline
2020-01-14 bkonyi@google.com Add back sky_engine/LICENSE (flutter/engine#15631)
2020-01-14 skia-flutter-autoroll@skia.org Roll src/third_party/skia 69ace2a0adbe..e45c5cd03eeb (23 commits) (flutter/engine#15584)


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 jimgraham@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

-82a851cf21cf3be23a172ee185bb5fb01bbad309
+ddaa9dc95f7bb1a66fc794f101b97bfae988235b