AU: Make proxy resolution asynchronous.

utils.cc

Index: utils.cc
diff --git a/utils.cc b/utils.cc
index 7206171e89e4dd24534fb975fa9554931c217410..502b0d1ab134092b32411a0695eb1142c2f70159 100644
--- a/utils.cc
+++ b/utils.cc
@@ -26,6 +26,7 @@
 #include <base/string_util.h>
 #include <base/logging.h>
 #include <cros_boot_mode/boot_mode.h>
+#include <google/protobuf/stubs/common.h>
 #include <rootdev/rootdev.h>
 
 #include "update_engine/file_writer.h"
@@ -551,6 +552,13 @@ int FuzzInt(int value, unsigned int range) {
   return base::RandInt(min, max);
 }
 
+gboolean GlibRunClosure(gpointer data) {
+  google::protobuf::Closure* callback =
+      reinterpret_cast<google::protobuf::Closure*>(data);
+  callback->Run();
+  return FALSE;
+}
+
 const char* const kStatefulPartition = "/mnt/stateful_partition";
 
 }  // namespace utils