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 2e2da80e3bcaacc735de89fdc184792194fcfd89..1876a1ce6b953381b1843cf2b996cf8e16170e9d 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);

[rmcilroy, 2015/02/13 16:14:00]

Let's do this in a different patch (just in case we need to revert it again, at
least it will be easier to re-land).  Also remove the TODO above when you
actually do this.

[Sami, 2015/02/13 16:22:34]

Oops, I wasn't actually meaning to do it here. My bad, thanks for spotting.

 
   for (size_t i = 0; i < TASK_QUEUE_COUNT; i++) {
     task_queue_manager_->SetQueueName(
@@ -446,4 +446,16 @@ 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