code: def set_messenger_theme(self, theme="default", location="default",
                              max_messages="default"):
          
          if not theme:
              theme = "default"  # "future"
          if not location:
              location = "default"  # "bottom_right"
          if not max_messages:
              max_messages = "default"  # "8"
          js_utils.set_messenger_theme(
              self.driver, theme=theme,
              location=location, max_messages=max_messages)
docs: Sets a theme for posting messages.
              Themes: ["flat", "future", "block", "air", "ice"]
              Locations: ["top_left", "top_center", "top_right",
                          "bottom_left", "bottom_center", "bottom_right"]
              max_messages is the limit of concurrent messages to display.