Roll engine e54bc4e..a84b210 (6 commits)

flutter/engine@e54bc4e...a84b210

git log e54bc4e..a84b210 --date=short --no-merges --format='%%ad %%ae %%s'
2018-08-10 tvolkert@users.noreply.github.com Reference platform_strong.dill, not platform.dill (flutter/engine#5992)
2018-08-10 jason-simmons@users.noreply.github.com Update to FreeType 2.9.1 (flutter/engine#5991)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 5b5d84cc1f37..6ed63968a391 (4 commits) (flutter/engine#5989)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 0d5d0659a684..5b5d84cc1f37 (39 commits) (flutter/engine#5988)
2018-08-10 kustermann.martin@gmail.com Roll Dart to version be6309690fd60284a87f3258a740c7c30efb1092 (flutter/engine#5987)
2018-08-09 a-siva@users.noreply.github.com Roll Dart to version 1be785ae2ddb1754a184cd638ab719e94d86b4e9 (flutter/engine#5985)

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

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, who should
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Author: engine-flutter-autoroll

bin/internal/engine.version

@@ -1 +1 @@
-e54bc4ea1832352c4c92f54ed6919ac5bff154ab
+a84b210b3d26513522d65060456517aee3335b20