Move Callback-related generated actions to a custom/ file.
diff --git a/include/gmock/internal/custom/callback-actions.h b/include/gmock/internal/custom/callback-actions.h
new file mode 100644
index 0000000..90db304
--- /dev/null
+++ b/include/gmock/internal/custom/callback-actions.h
@@ -0,0 +1,8 @@
+// This file was GENERATED by command:
+// pump.py callback-actions.h.pump
+// DO NOT EDIT BY HAND!!!
+
+#ifndef GMOCK_INCLUDE_GMOCK_INTERNAL_CUSTOM_CALLBACK_ACTIONS_H_
+#define GMOCK_INCLUDE_GMOCK_INTERNAL_CUSTOM_CALLBACK_ACTIONS_H_
+
+#endif // GMOCK_INCLUDE_GMOCK_INTERNAL_CUSTOM_CALLBACK_ACTIONS_H_