Roll engine c5e30553cd1a..5e155c6c2d35 (5 commits) (#38594)

git@github.com:flutter/engine.git/compare/c5e30553cd1a...5e155c6c2d35

git log c5e30553cd1a..5e155c6c2d35 --no-merges --oneline
2019-08-14 xiao@xster.net some drive-by docs while I was reading the embedding classes (flutter/engine#9341)
2019-08-14 jason-simmons@users.noreply.github.com Initialize the engine in the running state to match the animator's default state (flutter/engine#11011)
2019-08-14 liyuqian@google.com Trace RasterCacheResult::Draw (flutter/engine#11004)
2019-08-14 stuartmorgan@google.com Rename macOS FLE* classes to Flutter* (flutter/engine#11010)
2019-08-14 james@clarkezone.net [Windows] Alternative Windows shell platform implementation (flutter/engine#9835)

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bin/internal/engine.version

-c5e30553cd1a875e0908c97b6a659c131e795609
+5e155c6c2d3571184324c7b807e41427a86915d3