Redirect the MessageLoop's task runner to the renderer scheduler

components/scheduler/child/nestable_task_runner_for_test.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/scheduler/child/nestable_task_runner_for_test.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 
 namespace scheduler {
@@ skipping 16 matching lines @@
 void NestableTaskRunnerForTest::WrapTask(
     const base::PendingTask* wrapped_task) {
   scoped_refptr<NestableTaskRunnerForTest> protect(this);
   FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_,
                     DidProcessTask(*wrapped_task));
   wrapped_task->task.Run();
   FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_,
                     WillProcessTask(*wrapped_task));
 }
 
+void NestableTaskRunnerForTest::SetDefaultTaskRunner(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
+  default_task_runner_ = task_runner.Pass();
+}
+
 bool NestableTaskRunnerForTest::PostDelayedTask(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
     base::TimeDelta delay) {
   base::PendingTask* wrapped_task = new base::PendingTask(from_here, task);
   return task_runner_->PostDelayedTask(
       from_here,
       base::Bind(&NestableTaskRunnerForTest::WrapTask,
                  weak_nestable_task_runner_ptr_, base::Owned(wrapped_task)),
       delay);
@@ skipping 27 matching lines @@
     base::MessageLoop::TaskObserver* task_observer) {
   task_observers_.AddObserver(task_observer);
 }
 
 void NestableTaskRunnerForTest::RemoveTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   task_observers_.RemoveObserver(task_observer);
 }
 
 }  // namespace scheduler