Redirect the MessageLoop's task runner to the renderer scheduler

components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc

Index: components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc
diff --git a/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc b/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc
index 999d8567a1f03be79f526b42b6aa6340254a80df..1ad2b172236c3c7e84eb8215dda6b8e58a78af66 100644
--- a/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc
+++ b/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc
@@ -33,9 +33,20 @@ base::MessageLoop* LazySchedulerMessageLoopDelegateForTests::EnsureMessageLoop()
     message_loop_->AddTaskObserver(observer);
   }
   pending_observers_.clear();
+  if (pending_task_runner_)
+    message_loop_->SetTaskRunner(pending_task_runner_.Pass());
   return message_loop_;
 }
 
+void LazySchedulerMessageLoopDelegateForTests::SetDefaultTaskRunner(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
+  if (!HasMessageLoop()) {
+    pending_task_runner_ = task_runner.Pass();
+    return;
+  }
+  message_loop_->SetTaskRunner(task_runner.Pass());
+}
+
 bool LazySchedulerMessageLoopDelegateForTests::HasMessageLoop() const {
   return message_loop_ != nullptr;
 }