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Do not pass nullable parameters of simple types to Tonic-wrapped native functions#33159
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Lgtm
We should also update the DartWrappable converter to check for null
…ve functions Tonic converters for simple types do not expect to receive nulls from Dart. If the caller uses a null, then Tonic will pass the null to Dart APIs such as Dart_GetNativeDoubleArgument which will return an error handle. Tonic then ignores the error and returns a default value for the converted type. This PR does an explicit mapping from nulls to default values and avoids the unnecessary overhead of constructing the error in the Dart APIs. Also add a test that checks function signatures in the dart:ui package for nullable arguments of these types.
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…ped native functions (flutter/engine#33159)
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Tonic converters for simple types do not expect to receive nulls from Dart.
If the caller uses a null, then Tonic will pass the null to Dart APIs such as
Dart_GetNativeDoubleArgument which will return an error handle. Tonic then
ignores the error and returns a default value for the converted type.
This PR does an explicit mapping from nulls to default values and avoids the
unnecessary overhead of constructing the error in the Dart APIs.
Also add a test that checks function signatures in the dart:ui package for
nullable arguments of these types.