d96d942ddc
* Extract WideToUTF16String/UTF16StringToWide to FML In third_party/accessibility, for string conversion, we use a mix of: * FML * third_party/accessibility base string utility functions * static functions local to the translation unit itself This moves all conversions between UTF16 and wide strings to FML. Note that this implementation is only safe on platforms where: * the size of wchar_t and char16_t are the same * the encoding of wchar_t and char16_t are both UTF-16 which is the case for Windows, hence why these functions are implemented in a Windows-specific translation unit (wstring_conversion). Issue: https://github.com/flutter/flutter/issues/118811 * Migrate UTF16ToWide as well