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4af869e8d3
Support trailing closure syntax in FlutterRunLoop perform methods. This
allows us to write Swift code like:
```
FlutterRunLoop.mainLoop.perform(withDelay: delay) {
// code.
}
```
This also matches the ordering used in NSRunLoop/RunLoop:
*
https://developer.apple.com/documentation/foundation/runloop/perform(inmodes:block:)?language=objc
*
https://developer.apple.com/documentation/foundation/runloop/perform(inmodes:block:)
Follow-up to flutter/flutter#168174.
No tests since this is just a method rename.
Issue: https://github.com/flutter/flutter/issues/144791
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