verify static method
Ensures that the platform instance was constructed with a non-const token
that matches the provided token and throws AssertionError if not.
This is used to ensure that implementers are using extends rather than
implements.
Subclasses of MockPlatformInterfaceMixin are assumed to be valid in debug
builds.
This is implemented as a static method so that it cannot be overridden
with noSuchMethod.
Implementation
static void verify(Interactive3dPlatform instance) {
PlatformInterface.verifyToken(instance, _token);
}