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     28 
     29 from webkitpy.tool.steps.abstractstep import AbstractStep
     30 
     31 
     32 # FIXME: Unify with StepSequence?  I'm not sure yet which is the better design.
     33 class MetaStep(AbstractStep):
     34     substeps = [] # Override in subclasses
     35     def __init__(self, tool, options):
     36         AbstractStep.__init__(self, tool, options)
     37         self._step_instances = []
     38         for step_class in self.substeps:
     39             self._step_instances.append(step_class(tool, options))
     40 
     41     @staticmethod
     42     def _collect_options_from_steps(steps):
     43         collected_options = []
     44         for step in steps:
     45             collected_options = collected_options + step.options()
     46         return collected_options
     47 
     48     @classmethod
     49     def options(cls):
     50         return cls._collect_options_from_steps(cls.substeps)
     51 
     52     def run(self, state):
     53         for step in self._step_instances:
     54              step.run(state)
     55