add __FILE__:__LINE__ points in generated code to make round tripping easier
add __FILE__:__LINE__ points in generated code to make round tripping easier

dougbeal/google-api-swift-client-for-rest,dougbeal/google-api-swift-client-for-rest,dougbeal/google-api-swift-client-for-rest,dougbeal/google-api-swift-client-for-rest