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 41c69cc7ae3dbdffbb3df71a2fcc0a061a5b90d3..9bcb3b9a1a935a35f3075ad1acfa86952c0dc66f 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.