My cef version is "78.3.9+gc7345f2+chromium-78.0.3904.108".
I call AddCustomScheme with CEF_SCHEME_OPTION_STANDARD, then console log most following error.
[1231/172324.638:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.639:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.648:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.649:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.650:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.654:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.655:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.663:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.664:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.669:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.670:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.677:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.684:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.689:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.690:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.695:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )
[1231/172324.697:WARNING:pref_notifier_impl.cc(61)] Init observer found at shutdown.
[1231/172324.705:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_DESERIALIZATION_FAILED (network.mojom.NetworkContext.1 )