tree 95b00debd63abc2cfd7078bf082bbd43b19df403
parent 8e2278bd8d8188883cd57ed62df2bd98375fab31
author Alexander Markov <alexmarkov@google.com> 1518216028 -0800
committer GitHub <noreply@github.com> 1518216028 -0800
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Roll engine to a031239a5d4e44e60d0ebc62b8c544a9f592fc22 (#14601)

Includes:
* Exclude frontend_server from the license crawl (https://github.com/flutter/engine/pull/4645)
* Make native wrapper classes non-abstract (https://github.com/flutter/engine/pull/4607)
* Restrict clang-format to C, C++, Obj-C, Obj-C++ (https://github.com/flutter/engine/pull/4654)