moko256 efd03ad7ee Windows: Add SettingsPlugin to add theme change support in win32 (flutter/engine#29303)
* Windows: Add SettingsPlugin to separate sending and watching

* remove OnColorValuesChanged

* remove functions and test to handle brightness change from top-level window message

* add settings plugin test

* add files to licenses

* fix license

* use std::optional

* treat error

* fix comment based on code review
2022-04-29 01:10:24 -07:00
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