CosServiceApi constructor
      
      CosServiceApi({ 
    
- BinaryMessenger? binaryMessenger,
Constructor for CosServiceApi.  The binaryMessenger named argument is
available for dependency injection.  If it is left null, the default
BinaryMessenger will be used which routes to the host platform.
Implementation
CosServiceApi({BinaryMessenger? binaryMessenger})
    : _binaryMessenger = binaryMessenger;