diff --git a/test_utils.h b/test_utils.h
index 0ca4639..43ff339 100644
--- a/test_utils.h
+++ b/test_utils.h
@@ -13,6 +13,7 @@
 #include <string>
 #include <vector>
 
+#include <base/callback.h>
 #include <base/memory/scoped_ptr.h>
 #include <glib-object.h>
 #include <gtest/gtest.h>
@@ -274,6 +275,12 @@
   scoped_ptr<ScopedFilesystemUnmounter> unmounter_;
 };
 
+// Runs the default GLib main loop for at most |timeout_msec| or until the
+// function |terminate| returns true, whichever happens first. The function
+// |terminate| is called before every GLib main loop iteration and its value is
+// checked.
+void RunGMainLoopUntil(int timeout_msec, base::Callback<bool()> terminate);
+
 // Runs the default GLib main loop at most |iterations| times. This
 // dispatches all the events that are already waiting in the main loop and
 // those that get scheduled as a result of these events being attended.