flutter/engine@8df1757...ba045a2 (#49075)

```
git log 8df1757d3566..ba045a29ee73 --first-parent --oneline
2020-01-17 skia-flutter-autoroll@skia.org Roll src/third_party/dart c8f8c11b70b4..843bd2990881 (5 commits) (flutter/engine#15714)
2020-01-17 aam@google.com Roll dart to c8f8c11b70 (flutter/engine#15708)
2020-01-17 garyq@google.com Samsung fix duplication on punctuation: Update keyboard on finish compose. (flutter/engine#15701)
2020-01-17 skia-flutter-autoroll@skia.org Roll src/third_party/skia 2cd5d43f022c..d58b643f10f5 (21 commits) (flutter/engine#15707)
2020-01-17 chinmaygarde@google.com Disable GPUThreadMerger tests inline instead of via harness flags. (flutter/engine#15706)
2020-01-17 dnfield@google.com implicit casts and add missing docs (flutter/engine#15698)
2020-01-17 47866232+chunhtai@users.noreply.github.com loadfontfromlist should send fontchange message to framework (flutter/engine#14805)
```

bin/internal/engine.version

-8df1757d3566ffe699987673aec769b8f690882f
+ba045a29ee737d869cadc73969b900bc1e9d1131
\ No newline at end of file