60b8d00865
The response APIs for method channels and event channels used pointers for optional parameters; this kept the API surface simple, but meant that they couldn't take rvalues. As a result, returning success values or error details often took an extra line, declaring a variable for the result just to have something to pass the address of. This converts them to using references, with function overloading to allow for optional parameters, so that values can be inlined. For now the pointer versions are still present, so that conversion can be done before it becomes a breaking change; they will be removed soon. Part of https://github.com/flutter/flutter/issues/63975
Flutter Engine
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