Roll Flutter Engine from 68aa9ba386e1 to 4ac21cb7c6e0 (4 revisions)

[engine-flutter-autoroll]

https://github.com/flutter/engine/compare/68aa9ba386e1...4ac21cb7c6e0

2024-03-29 737941+loic-sharma@users.noreply.github.com Add completion callback to Shell::AddView (flutter/engine#51659) 2024-03-29 737941+loic-sharma@users.noreply.github.com [Windows] Move keyboard initialization (flutter/engine#51758) 2024-03-29 737941+loic-sharma@users.noreply.github.com [Windows] Don't always stop engine on view destruction (flutter/engine#51681) 2024-03-28 dkwingsmt@users.noreply.github.com [macOS] Group per-view information in FlutterCompositor into a class (flutter/engine#51738)

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 jacksongardner@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622

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

[auto-submit[bot]]

auto label is removed for flutter/flutter/145949, due to - The status or check suite Linux android_preview_tool_integration_tests has failed. Please fix the issues identified (or deflake) before re-applying this label.

[engine-flutter-autoroll]

Commit queue failed; closing this roll.