Add MacAddress to ONC and networkingPrivate

chromeos/network/network_util.h

Index: chromeos/network/network_util.h
diff --git a/chromeos/network/network_util.h b/chromeos/network/network_util.h
index 1fd7b49e775a6b41d3fa919ebf7f575cb9bb5ca3..6da2f7c12525db042eb58f5801cb1e686c27337b 100644
--- a/chromeos/network/network_util.h
+++ b/chromeos/network/network_util.h
@@ -81,6 +81,10 @@ CHROMEOS_EXPORT std::string PrefixLengthToNetmask(int32 prefix_length);
 // e.g. a |netmask| of 255.255.255.0 is converted to a prefixlen of 24
 CHROMEOS_EXPORT int32 NetmaskToPrefixLength(const std::string& netmask);
 
+// Returns |shill_mac_address| in aa:bb format.
+CHROMEOS_EXPORT std::string FormattedMacAddress(
+    const std::string& shill_mac_address);
+
 // Parses |list|, which contains DictionaryValues and returns a vector of
 // CellularScanResult in |scan_results|. Returns false if parsing fails,
 // in which case the contents of |scan_results| will be undefined.