20317 Allow extending the C++ standard codec (cla: yes)

20327 Revert “fuchsia: Remove dead code / break dependencies (#19396)” (#20… (cla: yes)

20333 Roll buildroot to b8d98f419b4c32eb1d575557d2c46e8c755ceac7 (cla: yes)

20337 engineCallbackOnPresent should return false if glContext is invalid (cla: yes)

20340 remove write parameter from _checkScreenshot (cla: yes)

20341 CanvasKit: switch to non-overloaded arcTo methods (cla: yes)

20343 Dedupe sources for fuchsia shell/tests (cla: yes, platform-fuchsia)