mttester.diff

diff --git a/shell/testing/tester_main.cc b/shell/testing/tester_main.cc
index 207e35301..1eb47637e 100644
--- a/shell/testing/tester_main.cc
+++ b/shell/testing/tester_main.cc
@@ -96,12 +96,16 @@ int RunTester(const blink::Settings& settings, bool run_forever) {
 
   auto current_task_runner = fml::MessageLoop::GetCurrent().GetTaskRunner();
 
+  ThreadHost host("whatever", ThreadHost::Type::UI | ThreadHost::Type::GPU |
+                                  ThreadHost::Type::IO);
+
   // Setup a single threaded test runner configuration.
-  const blink::TaskRunners task_runners(thread_label,  // dart thread label
-                                        current_task_runner,  // platform
-                                        current_task_runner,  // gpu
-                                        current_task_runner,  // ui
-                                        current_task_runner   // io
+  const blink::TaskRunners task_runners(
+      thread_label,                      // dart thread label
+      current_task_runner,               // platform
+      host.gpu_thread->GetTaskRunner(),  // gpu
+      host.ui_thread->GetTaskRunner(),   // ui
+      host.io_thread->GetTaskRunner()    // io
   );
 
   Shell::CreateCallback<PlatformView> on_create_platform_view =