scheduler: Implement task observers

content/renderer/scheduler/renderer_scheduler_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/scheduler/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 318 matching lines @@
   renderer_task_queue_selector_->DisableQueue(IDLE_TASK_QUEUE);
 }
 
 void RendererSchedulerImpl::SetTimeSourceForTesting(
     scoped_refptr<cc::TestNowSource> time_source) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   time_source_ = time_source;
   task_queue_manager_->SetTimeSourceForTesting(time_source);
 }
 
+void RendererSchedulerImpl::SetWorkBatchSizeForTesting(size_t work_batch_size) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  task_queue_manager_->SetWorkBatchSize(work_batch_size);
+}
+
 base::TimeTicks RendererSchedulerImpl::Now() const {
   return UNLIKELY(time_source_) ? time_source_->Now() : base::TimeTicks::Now();
 }
 
 RendererSchedulerImpl::PollableNeedsUpdateFlag::PollableNeedsUpdateFlag(
     base::Lock* write_lock_)
     : flag_(false), write_lock_(write_lock_) {
 }
 
 RendererSchedulerImpl::PollableNeedsUpdateFlag::~PollableNeedsUpdateFlag() {
@@ skipping 108 matching lines @@
       // With no observable effect, these meta events do not indicate a
       // meaningful touchstart response and should not impact task priority.
       return current_state;
 
     default:
       break;
   }
   return INPUT_ACTIVE;
 }
 
+void RendererSchedulerImpl::AddTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  if (task_queue_manager_)
+    task_queue_manager_->AddTaskObserver(task_observer);
+}
+
+void RendererSchedulerImpl::RemoveTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  if (task_queue_manager_)
+    task_queue_manager_->RemoveTaskObserver(task_observer);
+}
+
 }  // namespace content