Chore: Add region tags for nine objective-c samples

[oppenheimera]

No description provided.

[snippet-bot]

Here is the summary of changes.

You are about to add 9 region tags.

• GoogleMaps/GoogleMapsDemos/Samples/BasicMapViewController.m:15, tag maps_ios_sample_basic_map
• GoogleMaps/GoogleMapsDemos/Samples/GeocoderViewController.m:15, tag maps_ios_sample_reverse_geocode
• GoogleMaps/GoogleMapsDemos/Samples/GestureControlViewController.m:15, tag maps_ios_sample_map_gestures
• GoogleMaps/GoogleMapsDemos/Samples/MarkerEventsViewController.m:15, tag maps_ios_sample_marker_events
• GoogleMaps/GoogleMapsDemos/Samples/MarkerInfoWindowViewController.m:15, tag maps_ios_sample_marker_info_window
• GoogleMaps/GoogleMapsDemos/Samples/MarkersViewController.m:15, tag maps_ios_sample_add_marker
• GoogleMaps/GoogleMapsDemos/Samples/MyLocationViewController.m:15, tag maps_ios_sample_my_location_button
• GoogleMaps/GoogleMapsDemos/Samples/PolygonsViewController.m:15, tag maps_ios_sample_draw_polygons
• GoogleMaps/GoogleMapsDemos/Samples/PolylinesViewController.m:15, tag maps_ios_sample_draw_polylines

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