This adds ManagedNetworkConfigurationHandler first pass

chromeos/network/onc/onc_signature.h

Index: chromeos/network/onc/onc_signature.h
diff --git a/chromeos/network/onc/onc_signature.h b/chromeos/network/onc/onc_signature.h
index ee637feaa798f643036b5b51e5fbe457baf4e80b..ea7294f14dd6b6c6b3f4204645682db05b2f021f 100644
--- a/chromeos/network/onc/onc_signature.h
+++ b/chromeos/network/onc/onc_signature.h
@@ -31,6 +31,10 @@ CHROMEOS_EXPORT const OncFieldSignature* GetFieldSignature(
     const OncValueSignature& signature,
     const std::string& onc_field_name);
 
+const OncFieldSignature* GetShillFieldSignature(
+    const OncValueSignature& signature,
+    const std::string& shill_property_name);
+
 CHROMEOS_EXPORT extern const OncValueSignature kRecommendedSignature;
 CHROMEOS_EXPORT extern const OncValueSignature kEAPSignature;
 CHROMEOS_EXPORT extern const OncValueSignature kIssuerSubjectPatternSignature;