Reads the full crash history for a particular client.

def ReadClientCrashInfoHistory(self, client_id):
    """Reads the full crash history for a particular client."""
    history = self.crash_history.get(client_id)
    if not history:
      return []
    res = []
    for ts in sorted(history, reverse=True):
      client_data = rdf_client.ClientCrash.FromSerializedString(history[ts])
      client_data.timestamp = ts
      res.append(client_data)
    return res