Redirect the MessageLoop's task runner to the renderer scheduler

components/scheduler/child/scheduler_helper.cc

Index: components/scheduler/child/scheduler_helper.cc
diff --git a/components/scheduler/child/scheduler_helper.cc b/components/scheduler/child/scheduler_helper.cc
index 0e13c7635264e98231717d0933d1d0b0d57e22e2..6a878162e33ea3686d60c1d6d04d6c0d87da63f8 100644
--- a/components/scheduler/child/scheduler_helper.cc
+++ b/components/scheduler/child/scheduler_helper.cc
@@ -7,12 +7,12 @@
 #include "base/time/default_tick_clock.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
-#include "components/scheduler/child/nestable_single_thread_task_runner.h"
+#include "components/scheduler/child/scheduler_task_runner_delegate.h"
 
 namespace scheduler {
 
 SchedulerHelper::SchedulerHelper(
-    scoped_refptr<NestableSingleThreadTaskRunner> main_task_runner,
+    scoped_refptr<SchedulerTaskRunnerDelegate> main_task_runner,
     const char* tracing_category,
     const char* disabled_by_default_tracing_category,
     const char* disabled_by_default_verbose_tracing_category,
@@ -64,6 +64,9 @@ SchedulerHelper::SchedulerHelper(
 
   // TODO(skyostil): Increase this to 4 (crbug.com/444764).
   task_queue_manager_->SetWorkBatchSize(1);
+
+  main_task_runner->SetDefaultTaskRunner(

[alex clarke (OOO till 29th), 2015/07/10 15:21:11]

There was a test for this when it was on the TQM.  Should there be test for this
now?

[Sami, 2015/07/10 15:35:13]

Yep, it's now in components/scheduler/child/scheduler_helper_unittest.cc.

+      task_queue_manager_->TaskRunnerForQueue(QueueId::DEFAULT_TASK_QUEUE));
 }
 
 SchedulerHelper::~SchedulerHelper() {