Roll engine 2b94311a7764..3af2b1a78c66 (6 commits)

[engine-flutter-autoroll]

flutter/engine@2b94311...3af2b1a

git log 2b94311..3af2b1a --first-parent --oneline
2020-04-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from _dAFU... to G4HpJ... (flutter/engine#17938)
2020-04-24 mouad.debbar@gmail.com [web] Fix exception when getting boxes for rich text range (flutter/engine#17933)
2020-04-24 ferhat@gmail.com [web] Batch systemFontChange messages (flutter/engine#17885)
2020-04-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from kpECk... to _dAFU... (flutter/engine#17929)
2020-04-24 skia-flutter-autoroll@skia.org Roll src/third_party/skia b965ff597315..1e21d14f2b8b (25 commits) (flutter/engine#17928)
2020-04-24 skia-flutter-autoroll@skia.org Roll src/third_party/dart 94178e920ee8..a69cb6d700f5 (22 commits) (flutter/engine#17926)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

[fluttergithubbot]

This pull request is not suitable for automatic merging in its current state.

• The status or check suite Cirrus CI has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite fuchsia_precache-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
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• The status or check suite tool_tests-integration-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite web_integration_tests has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite web_tests-0-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite web_tests-1-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
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• The status or check suite web_tests-5-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
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• The status or check suite web_tests-7_last-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
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• The status or check suite hostonly_devicelab_tests-3_last-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
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• The status or check suite framework_tests-widgets-macos has failed. Please fix the issues identified (or deflake) before re-applying this label.
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• The status or check suite tool_tests-integration-macos has failed. Please fix the issues identified (or deflake) before re-applying this label.
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[engine-flutter-autoroll]

Commit queue failed; closing this roll.