libchrome: add support for synchronous PropertySet::Set to dbus

dbus/property.cc

Index: dbus/property.cc
diff --git a/dbus/property.cc b/dbus/property.cc
index dde061118bb8dc376f8818e188862c12a000dd31..b7a0c8be458bef4c5c0e35a4e2a3337e98658fab 100644
--- a/dbus/property.cc
+++ b/dbus/property.cc
@@ -174,6 +174,22 @@ void PropertySet::Set(PropertyBase* property, SetCallback callback) {
                                        callback));
 }
 
+bool PropertySet::SetAndBlock(PropertyBase* property) {
+  MethodCall method_call(kPropertiesInterface, kPropertiesSet);
+  MessageWriter writer(&method_call);
+  writer.AppendString(interface());
+  writer.AppendString(property->name());
+  property->AppendSetValueToWriter(&writer);
+
+  DCHECK(object_proxy_);
+  scoped_ptr<dbus::Response> response(
+      object_proxy_->CallMethodAndBlock(&method_call,
+      ObjectProxy::TIMEOUT_USE_DEFAULT));
+  if (response.get())
+    return true;
+  return false;
+}
+
 void PropertySet::OnSet(PropertyBase* property,
                         SetCallback callback,
                         Response* response) {