chrome: dbus: support asynchronous method replies

dbus/exported_object.cc

Index: dbus/exported_object.cc
diff --git a/dbus/exported_object.cc b/dbus/exported_object.cc
index e4a1641fa6e5ee67692bd383da896237e07a139c..d4113fa3bb3b4edcf0122712824cb84ebea5080e 100644
--- a/dbus/exported_object.cc
+++ b/dbus/exported_object.cc
@@ -224,12 +224,12 @@ DBusHandlerResult ExportedObject::HandleMessage(
                                             method_call.release(),
                                             start_time));
   } else {
-    // If the D-Bus thread is not used, just call the method directly. We
-    // don't need the complicated logic to wait for the method call to be
-    // complete.
-    // |response| will be deleted in OnMethodCompleted().
-    Response* response = iter->second.Run(method_call.get());
-    OnMethodCompleted(method_call.release(), response, start_time);
+    // If the D-Bus thread is not used, just call the method directly.
+    iter->second.Run(method_call.get(),
+                     base::Bind(&ExportedObject::SendResponse,
+                                this,
+                                start_time,
+                                method_call.release()));
   }
 
   // It's valid to say HANDLED here, and send a method response at a later
@@ -241,14 +241,27 @@ void ExportedObject::RunMethod(MethodCallCallback method_call_callback,
                                MethodCall* method_call,
                                base::TimeTicks start_time) {
   bus_->AssertOnOriginThread();
+  method_call_callback.Run(method_call,
+                           base::Bind(&ExportedObject::SendResponse,
+                                      this,
+                                      start_time,
+                                      method_call));
+}
 
-  Response* response = method_call_callback.Run(method_call);
-  bus_->PostTaskToDBusThread(FROM_HERE,
-                             base::Bind(&ExportedObject::OnMethodCompleted,
-                                        this,
-                                        method_call,
-                                        response,
-                                        start_time));
+void ExportedObject::SendResponse(base::TimeTicks start_time,
+                                  MethodCall* method_call,
+                                  Response* response) {
+  DCHECK(method_call);
+  if (bus_->HasDBusThread()) {
+    bus_->PostTaskToDBusThread(FROM_HERE,
+                               base::Bind(&ExportedObject::OnMethodCompleted,
+                                          this,
+                                          method_call,
+                                          response,
+                                          start_time));
+  } else {
+    OnMethodCompleted(method_call, response, start_time);
+  }
 }
 
 void ExportedObject::OnMethodCompleted(MethodCall* method_call,