This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/ui/webui/options/chromeos/internet_options_handler.cc

Index: chrome/browser/ui/webui/options/chromeos/internet_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/chromeos/internet_options_handler.cc b/chrome/browser/ui/webui/options/chromeos/internet_options_handler.cc
index bc63f1f019261044a4c79bb9238af431a181274e..1dd4ae47d9a34820c87e4f35bcd9dbf3df10222c 100644
--- a/chrome/browser/ui/webui/options/chromeos/internet_options_handler.cc
+++ b/chrome/browser/ui/webui/options/chromeos/internet_options_handler.cc
@@ -1227,6 +1227,22 @@ void InternetOptionsHandler::PopulateDictionaryDetailsCallback(
     const chromeos::Network* network,
     const std::string& service_path,
     const base::DictionaryValue* shill_properties) {
+  // Have to copy the properties because the object will be out of scope when
+  // this function call completes (it's owned by the calling function).
+  base::DictionaryValue* shill_props_copy = shill_properties->DeepCopy();
+  chromeos::CrosListIPConfigs(
+      network->device_path(),
+      base::Bind(&InternetOptionsHandler::PopulateIPConfigsCallback,
+                 weak_factory_.GetWeakPtr(),
+                 network,
+                 base::Owned(shill_props_copy)));
+}
+
+void InternetOptionsHandler::PopulateIPConfigsCallback(
+    const chromeos::Network* network,
+    base::DictionaryValue* shill_properties,
+    const chromeos::NetworkIPConfigVector& ipconfigs,
+    const std::string& hardware_address) {
   if (VLOG_IS_ON(2)) {
     std::string properties_json;
     base::JSONWriter::WriteWithOptions(shill_properties,
@@ -1244,10 +1260,6 @@ void InternetOptionsHandler::PopulateDictionaryDetailsCallback(
       cros_->FindOncForNetwork(network->unique_id());
 
   base::DictionaryValue dictionary;
-  std::string hardware_address;
-  chromeos::NetworkIPConfigVector ipconfigs = cros_->GetIPConfigs(
-      network->device_path(), &hardware_address,
-      chromeos::NetworkLibrary::FORMAT_COLON_SEPARATED_HEX);
   if (!hardware_address.empty())
     dictionary.SetString(kTagHardwareAddress, hardware_address);
 
@@ -1304,7 +1316,8 @@ void InternetOptionsHandler::PopulateDictionaryDetailsCallback(
                        static_ip_dict.release(),
                        property_ui_data);
   } else {
-    LOG(ERROR) << "Unable to fetch IP configuration for " << service_path;
+    LOG(ERROR) << "Unable to fetch IP configuration for "
+               << network->service_path();
     // If we were unable to fetch shill_properties for some reason,
     // then just go with some defaults.
     dictionary.SetBoolean(kIpConfigAutoConfig, false);