From f34f528c1fc4512910b2acc586e678ddb53eaf9e Mon Sep 17 00:00:00 2001
From: Hidehiko Abe <hidehiko@chromium.org>
Date: Wed, 2 Oct 2019 09:53:00 +0900
Subject: [PATCH] libchrome: Add EmptyResponseCallback for backward
 compatiblity.

BUG=chromium:909719
TEST=Build locally.

Change-Id: I4d6c75f267fd6c170b966647c30c91bb02b3ee14
---
 dbus/object_proxy.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/dbus/object_proxy.h b/dbus/object_proxy.h
index 22e44f1..7d62eb9 100644
--- a/dbus/object_proxy.h
+++ b/dbus/object_proxy.h
@@ -13,6 +13,7 @@
 #include <string>
 #include <vector>
 
+#include "base/bind.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -105,6 +106,12 @@ class CHROME_DBUS_EXPORT ObjectProxy
   using OnConnectedCallback =
       base::OnceCallback<void(const std::string&, const std::string&, bool)>;
 
+  // TOOD(crbug.com/909719): This is just for backward compatibility.
+  // Remove this callback after clients are migrated.
+  static ResponseCallback EmptyResponseCallback() {
+    return base::BindOnce([](Response*){});
+  }
+
   // Calls the method of the remote object and blocks until the response
   // is returned. Returns NULL on error with the error details specified
   // in the |error| object.
-- 
2.23.0.581.g78d2f28ef7-goog