@classmethod
def getHeapUsage(cls):
    """Returns the JavaScript heap usage.
It is the total usage of the corresponding isolate not scoped to a particular Runtime.
        """
    return cls.build_send_payload('getHeapUsage', {}), cls.convert_payload({
        'usedSize': {'class': float, 'optional': False}, 'totalSize': {
        'class': float, 'optional': False}})
