scheduler: Implement task observers

content/renderer/scheduler/renderer_scheduler_impl.cc

Index: content/renderer/scheduler/renderer_scheduler_impl.cc
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.cc b/content/renderer/scheduler/renderer_scheduler_impl.cc
index 6d5c8a049ec142eb9567a706043e42ea5942d446..279ec5f8a8e3a43414c952a90699345f3f51863a 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.cc
+++ b/content/renderer/scheduler/renderer_scheduler_impl.cc
@@ -48,7 +48,7 @@ RendererSchedulerImpl::RendererSchedulerImpl(
   renderer_task_queue_selector_->DisableQueue(IDLE_TASK_QUEUE);
   task_queue_manager_->SetAutoPump(IDLE_TASK_QUEUE, false);
   // TODO(skyostil): Increase this to 4 (crbug.com/444764).
-  task_queue_manager_->SetWorkBatchSize(1);
+  task_queue_manager_->SetWorkBatchSize(4);
 
   for (size_t i = 0; i < TASK_QUEUE_COUNT; i++) {
     task_queue_manager_->SetQueueName(
@@ -445,4 +445,16 @@ RendererSchedulerImpl::ComputeNewInputStreamState(
   return INPUT_ACTIVE;
 }
 
+void RendererSchedulerImpl::AddTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  task_queue_manager_->AddTaskObserver(task_observer);
+}
+
+void RendererSchedulerImpl::RemoveTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  task_queue_manager_->RemoveTaskObserver(task_observer);
+}
+
 }  // namespace content