dbus: adding PostTaskToDBusThreadAndReply

dbus/bus.cc

Index: dbus/bus.cc
diff --git a/dbus/bus.cc b/dbus/bus.cc
index 0d170ff818508aec62079fc11e252196c0afef86..fafacd3e7dac64f5d76d1d412c03341a1ec1f6e3 100644
--- a/dbus/bus.cc
+++ b/dbus/bus.cc
@@ -775,6 +775,24 @@ void Bus::ProcessAllIncomingDataIfAny() {
   }
 }
 
+void Bus::PostTaskToDBusThreadAndReply(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task,
+    const base::Closure& reply) {
+  AssertOnOriginThread();
+
+  if (dbus_task_runner_.get()) {
+    if (!dbus_task_runner_->PostTaskAndReply(from_here, task, reply)) {
+      LOG(WARNING) << "Failed to post a task to the D-Bus thread message loop";
+    }
+  } else {
+    DCHECK(origin_task_runner_.get());
+    if (!origin_task_runner_->PostTaskAndReply(from_here, task, reply)) {
+      LOG(WARNING) << "Failed to post a task to the origin message loop";
+    }
+  }
+}
+
 void Bus::PostTaskToOriginThread(const tracked_objects::Location& from_here,
                                  const base::Closure& task) {
   DCHECK(origin_task_runner_.get());