Redirect the MessageLoop's task runner to the renderer scheduler

components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h

Index: components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
diff --git a/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h b/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
index a727a6dd8be1b53ccafd397aa475629b448b346b..40e78b2402121f667353c3d26a90a7a73da0d763 100644
--- a/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
+++ b/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
@@ -23,6 +23,8 @@ class LazySchedulerMessageLoopDelegateForTests
   static scoped_refptr<LazySchedulerMessageLoopDelegateForTests> Create();
 
   // NestableSingleThreadTaskRunner implementation
+  void SetDefaultTaskRunner(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner) override;
   bool PostDelayedTask(const tracked_objects::Location& from_here,
                        const base::Closure& task,
                        base::TimeDelta delay) override;
@@ -49,6 +51,9 @@ class LazySchedulerMessageLoopDelegateForTests
   // owned.
   mutable base::hash_set<base::MessageLoop::TaskObserver*> pending_observers_;
 
+  // A task runner which hasn't yet been overridden in the message loop.
+  mutable scoped_refptr<base::SingleThreadTaskRunner> pending_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(LazySchedulerMessageLoopDelegateForTests);
 };