Roll engine 36b5b1936765..dfd281bcaefe (3 commits) (#39153)

git@github.com:flutter/engine.git/compare/36b5b1936765...dfd281bcaefe

git log 36b5b1936765..dfd281bcaefe --no-merges --oneline
2019-08-23 skia-flutter-autoroll@skia.org Roll src/third_party/skia 0f15d7373bf1..e8a2c8053daa (8 commits) (flutter/engine#11418)
2019-08-23 yjbanov@google.com Shrink cirrus docker image: reduce RUN count, apt-get clean (flutter/engine#11416)
2019-08-23 chinmaygarde@google.com Avoid root surface acquisition during custom composition with software renderer. (flutter/engine#11394)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (liyuqian@google.com), and stop
the roller if necessary.

bin/internal/engine.version

-36b5b19367656c6e84efbd7d03ed26b47840b728
+dfd281bcaefe79bed77fc0aa42c5bb2632f64941