rasterizer regression from flutter engine roll

This issue has been tracked since 2023-03-17.

description

The following benchmarks have experienced a regression as a result of a engine roll into the framework of about 16%:

2023-03-16 [email protected] Update documentation on AccessibilityFeatures.boldText (flutter/engine#40364)
2023-03-16 [email protected] Output web test artifacts to out directory. (flutter/engine#40355)
2023-03-16 [email protected] [Impeller] Update scene importer tests (flutter/engine#40363)
2023-03-16 [email protected] Handle error more gracefully, add test for same (flutter/engine#40361)
2023-03-16 [email protected] Remove work around for dart 3 compiler bug (flutter/engine#40350)
2023-03-16 [email protected] [Impeller] mark decoded images as optimized for GPU access (flutter/engine#40356)
2023-03-16 [email protected] Fix incorrect usage of fl_method_error_response_new in documentation example (flutter/engine#40288)
2023-03-16 [email protected] [Impeller] fix opacity inheritance test (flutter/engine#40360)

gaaclarke wrote this answer on 2023-03-17

After reviewing all the possible PR's I believe the regression happened in flutter/engine#40356

jonahwilliams wrote this answer on 2023-03-17

This likely regressed because I added another command to the command buffer used for the blit pass, and we currently block on command completition:

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