Roll engine e7b69ced2e24..5b870a218f15 (3 commits) (#46569)

https://github.com/flutter/engine/compare/e7b69ced2e24...5b870a218f15

git log e7b69ced2e24..5b870a218f15 --first-parent --oneline
2019-12-08 wvvwwvw@gmail.com Add support for setting window size limits for glfw (flutter/engine#13415)
2019-12-06 iska.kaushik@gmail.com [fuchsia] SnapToNextPhase refactor + add tests and documentation (flutter/engine#14158)
2019-12-06 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from VKso5... to 9C6UA... (flutter/engine#14161)


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 chinmaygarde@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

-e7b69ced2e2408da86261227a04f09e0c0fe905d
+5b870a218f1584e80b13722f124dc5b0e9c5ab3a