Implement WebFrameScheduler and WebPageScheduler

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 f39da7927192fe67c633abb3c192ebae476b2133..537d9b83d855f40887b155dad6b7948010dc6aed 100644
--- a/components/scheduler/child/scheduler_helper.cc
+++ b/components/scheduler/child/scheduler_helper.cc
@@ -24,18 +24,17 @@ SchedulerHelper::SchedulerHelper(
                                disabled_by_default_verbose_tracing_category)),
       control_task_runner_(NewTaskQueue(
           TaskQueue::Spec("control_tq")
-              .SetWakeupPolicy(
-                  TaskQueue::WakeupPolicy::DONT_WAKE_OTHER_QUEUES)
+              .SetWakeupPolicy(TaskQueue::WakeupPolicy::DONT_WAKE_OTHER_QUEUES)
               .SetShouldNotifyObservers(false))),
       control_after_wakeup_task_runner_(NewTaskQueue(
           TaskQueue::Spec("control_after_wakeup_tq")
               .SetPumpPolicy(TaskQueue::PumpPolicy::AFTER_WAKEUP)
-              .SetWakeupPolicy(
-                  TaskQueue::WakeupPolicy::DONT_WAKE_OTHER_QUEUES)
+              .SetWakeupPolicy(TaskQueue::WakeupPolicy::DONT_WAKE_OTHER_QUEUES)
               .SetShouldNotifyObservers(false))),
       default_task_runner_(NewTaskQueue(TaskQueue::Spec("default_tq")
                                             .SetShouldMonitorQuiescence(true))),
       time_source_(new base::DefaultTickClock),
+      queue_observer_(nullptr),
       tracing_category_(tracing_category),
       disabled_by_default_tracing_category_(
           disabled_by_default_tracing_category) {
@@ -124,4 +123,17 @@ void SchedulerHelper::RemoveTaskObserver(
     task_queue_manager_->RemoveTaskObserver(task_observer);
 }
 
+void SchedulerHelper::SetQueueObserver(Observer* observer) {
+  CheckOnValidThread();
+  queue_observer_ = observer;
+  if (task_queue_manager_)

[Sami, 2015/09/10 15:10:23]

I think DCHECKing that we still have a manager would lead to fewer surprises.

[alex clarke (OOO till 29th), 2015/09/10 15:56:24]

Done.

+    task_queue_manager_->SetQueueObserver(this);

[Sami, 2015/09/10 15:10:23]

Should probably remove this in the destructor.

[alex clarke (OOO till 29th), 2015/09/10 15:56:24]

Not sure that's worth doing since this class owns task_queue_manager_.  WDYT?

[Sami, 2015/09/11 11:34:43]

Ah right I didn't notice that. Usually I like to have explicit calls but this
works too.

+}
+
+void SchedulerHelper::OnUnregisterTaskQueue(
+    const scoped_refptr<internal::TaskQueueImpl>& queue) {
+  if (queue_observer_)
+    queue_observer_->OnUnregisterTaskQueue(queue);
+}
+
 }  // namespace scheduler