Roll engine 81f695fc954a..797157bdecb5 (5 commits) (#37808)

git@github.com:flutter/engine.git/compare/81f695fc954a...797157bdecb5

git log 81f695fc954a..797157bdecb5 --no-merges --oneline
2019-08-07 jason-simmons@users.noreply.github.com Improvements to the flutter GDB script (flutter/engine#10675)
2019-08-07 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 9PJXr... to 8mNHG... (flutter/engine#10701)
2019-08-07 stuartmorgan@google.com Roll swiftshader (flutter/engine#10699)
2019-08-07 skia-flutter-autoroll@skia.org Roll src/third_party/skia 593290ed75fd..b2c5a94b1c7a (9 commits) (flutter/engine#10697)
2019-08-07 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from eXzeO... to UeWpb... (flutter/engine#10695)

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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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bin/internal/engine.version

-81f695fc954a8450c47de829e843b688ca9212df
+797157bdecb5a0d3b9b15dd8992712d65e3dd34d