Roll engine 4a849e0f8dd5..819b0cae0c23 (6 commits) (#42240)

git@github.com:flutter/engine.git/compare/4a849e0f8dd5...819b0cae0c23

git log 4a849e0f8dd5..819b0cae0c23 --no-merges --oneline
2019-10-08 skia-flutter-autoroll@skia.org Roll src/third_party/skia f611d943fb73..a28cf7c08061 (29 commits) (flutter/engine#12993)
2019-10-08 garyq@google.com Unpublicize kDoNotResizeDimension (flutter/engine#12989)
2019-10-08 skia-flutter-autoroll@skia.org Roll src/third_party/skia 4c82a9fc83a5..f611d943fb73 (1 commits) (flutter/engine#12831)
2019-10-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from kwa2O... to wOfz2... (flutter/engine#12827)
2019-10-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from by2LL... to gB_ii... (flutter/engine#12979)
2019-10-08 jason-simmons@users.noreply.github.com Roll Wuffs to 0.2.0-rc.1 (flutter/engine#12983)


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

-4a849e0f8dd50adaf1ccf3d386a90d994ca95c55
+819b0cae0c23ecaf84d5ff6dd0548e21587cf8b2