GMSNavigationDrivingSide
enum GMSNavigationDrivingSide : NSUInteger {}Whether this step is on a drive-on-right or drive-on-left route. May be unspecified.
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                  Unspecified side. DeclarationSwift case none = 0Objective-C GMSNavigationDrivingSideNone = 0
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                  Drive-on-left side. DeclarationSwift case left = 1Objective-C GMSNavigationDrivingSideLeft = 1
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                  Drive-on-right side. DeclarationSwift case right = 2Objective-C GMSNavigationDrivingSideRight = 2