Remove after wakeup logic and replace PumpTask with Fences

third_party/WebKit/Source/platform/scheduler/child/single_thread_idle_task_runner.cc

Index: third_party/WebKit/Source/platform/scheduler/child/single_thread_idle_task_runner.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/single_thread_idle_task_runner.cc b/third_party/WebKit/Source/platform/scheduler/child/single_thread_idle_task_runner.cc
index dfb50c313f946d1d1e3549b3ba268f3147b8d4da..b6df36b69d1396c1047b907738f14b20ded1e693 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/single_thread_idle_task_runner.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/single_thread_idle_task_runner.cc
@@ -13,19 +13,15 @@ namespace scheduler {
 
 SingleThreadIdleTaskRunner::SingleThreadIdleTaskRunner(
     scoped_refptr<base::SingleThreadTaskRunner> idle_priority_task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> after_wakeup_task_runner,
     Delegate* delegate,
     const char* tracing_category)
     : idle_priority_task_runner_(idle_priority_task_runner),
-      after_wakeup_task_runner_(after_wakeup_task_runner),
       delegate_(delegate),
       tracing_category_(tracing_category),
       blame_context_(nullptr),
       weak_factory_(this) {
   DCHECK(!idle_priority_task_runner_ ||
          idle_priority_task_runner_->RunsTasksOnCurrentThread());
-  DCHECK(!after_wakeup_task_runner_ ||
-         after_wakeup_task_runner_->RunsTasksOnCurrentThread());
   weak_scheduler_ptr_ = weak_factory_.GetWeakPtr();
 }
 
@@ -57,16 +53,6 @@ void SingleThreadIdleTaskRunner::PostNonNestableIdleTask(
                             weak_scheduler_ptr_, idle_task));
 }
 
-void SingleThreadIdleTaskRunner::PostIdleTaskAfterWakeup(
-    const tracked_objects::Location& from_here,
-    const IdleTask& idle_task) {
-  // Don't signal posting of idle task to the delegate here, wait until the
-  // after-wakeup task posts the real idle task.
-  after_wakeup_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&SingleThreadIdleTaskRunner::PostIdleTask,
-                            weak_scheduler_ptr_, from_here, idle_task));
-}
-
 void SingleThreadIdleTaskRunner::RunTask(IdleTask idle_task) {
   base::TimeTicks deadline = delegate_->WillProcessIdleTask();
   TRACE_EVENT1(tracing_category_, "SingleThreadIdleTaskRunner::RunTask",