Move and rename TaskTimeTracker to public interface exposed to WebThread, use in WebPerf Agent.

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

 // Copyright 2015 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 "platform/scheduler/child/scheduler_helper.h"
 
 #include "base/time/default_tick_clock.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "platform/scheduler/base/task_queue_impl.h"
@@ skipping 99 matching lines @@
     task_queue_manager_->AddTaskObserver(task_observer);
 }
 
 void SchedulerHelper::RemoveTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   CheckOnValidThread();
   if (task_queue_manager_)
     task_queue_manager_->RemoveTaskObserver(task_observer);
 }
 
+void SchedulerHelper::AddTaskTimeObserver(
+    TaskTimeObserver* task_time_observer) {
+  if (task_queue_manager_)
+    task_queue_manager_->AddTaskTimeObserver(task_time_observer);
+}
+
+void SchedulerHelper::RemoveTaskTimeObserver(
+    TaskTimeObserver* task_time_observer) {
+  if (task_queue_manager_)
+    task_queue_manager_->RemoveTaskTimeObserver(task_time_observer);
+}
+
 void SchedulerHelper::SetObserver(Observer* observer) {
   CheckOnValidThread();
   observer_ = observer;
   DCHECK(task_queue_manager_);
   task_queue_manager_->SetObserver(this);
 }
 
 RealTimeDomain* SchedulerHelper::real_time_domain() const {
   CheckOnValidThread();
   DCHECK(task_queue_manager_);
@@ skipping 26 matching lines @@
 }
 
 TaskQueue* SchedulerHelper::CurrentlyExecutingTaskQueue() const {
   if (!task_queue_manager_)
     return nullptr;
   return task_queue_manager_->currently_executing_task_queue();
 }
 
 }  // namespace scheduler
 }  // namespace blink