24423 Add missing header guard, namespace (affects: desktop, affects: engine, affects: text input, cla: yes)

24424 Adjust header guards for updated paths (cla: yes)

24425 Roll Fuchsia Mac SDK from H0v5Ox4Vs… to eG4TqZBn9… (cla: yes, waiting for tree to go green)

24427 Roll Skia from 7cb0f6e9702a to 330578e81158 (1 revision) (cla: yes, waiting for tree to go green)

24428 Windows: Improve window resizing (cla: yes, waiting for tree to go green)

24430 Roll Fuchsia Linux SDK from KKD5xVYLO… to C2FaCuCLB… (cla: yes, waiting for tree to go green)