Captures errors codes that can be given by JSONFileValueDeserializer::Deserialize().

Reserved value. This should not be used. A runtime-update was successfully applied. The simulated trial is null, e.g. if the study had no randomized experiments at all. The selected group does not exist in the given seed (e.g., if the group was forced from the command line). The experiment is not a strict killswitch (e.g., it enables features). The study is not activated on startup (starts_active). The study does not have permanent consistency. The runtime mutable experiment has already been applied. The experiment references a feature that does not have runtime mutability enabled. The experiment references a feature that is overridden from the command line. The features specified are currently controlled by different trials. The trial currently controlling the features specified also specifies other features not in the runtime mutable experiment. A trial or runtime override with the same name already exists, and is not being replaced. The controlling trial could not be found. Updating the feature state failed. Applying the FieldTrial runtime override failed. Validation of the applied state failed. The runtime mutable experiment has a Google web experiment ID. The trial being overridden has a Google web experiment ID. The runtime mutable experiment has params. Reserved value. This should not be used. A runtime-update was successfully applied. A runtime-update was rejected because the targeted feature was not found to be enabled for runtime mutability. A runtime-update was rejected because the requested feature state is not supported. V0, for example, only supports the disabling of runtime-mutable features. The runtime-mutability of a feature has been disabled because the feature's state was set via a command-line override. This is not an error, per se, but is still worth logging to understand whether runtime mutability is being affected by command-line overrides. No seed used No seed used No seed used No seed used No seed used No seed used No seed used No seed used No seed used No seed used No seed used No seed used