Roll Flutter Engine from 4bf16c369bfc to f75287af0b19 (2 revisions) (#115891)
Roll Flutter Engine from 4bf16c369bfc to f75287af0b19 (2 revisions) (#115891)

* 8e458a2b6 [Impeller] Set color attachment pixel format to RGBA on OpenGLES backend (flutter/engine#37843)

* f75287af0 [Windows] Refactor `PlatformHandler`'s tests (flutter/engine#37820)
flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter