macOS: trailing closures for FlutterRunLoop.perform* #168415
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Support trailing closure syntax in FlutterRunLoop perform methods. This
allows us to write Swift code like:
```
FlutterRunLoop.mainLoop.perform(withDelay: delay) {
// code.
}
```
Follow-up to flutter#168174.
Issue: flutter#144791
|
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Support trailing closure syntax in FlutterRunLoop perform methods. This
allows us to write Swift code like:
This also matches the ordering used in NSRunLoop/RunLoop:
Follow-up to #168174.
No tests since this is just a method rename.
Issue: #144791
Pre-launch Checklist
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