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

third_party/WebKit/Source/platform/scheduler/renderer/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 "platform/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 1393 matching lines @@
         "to avoid this. Please see "
         "https://developers.google.com/web/tools/chrome-devtools/profile/evaluate-performance/rail"
         " and https://crbug.com/574343#c40 for more information.");
   }
 }
 
 void RendererSchedulerImpl::ReportTaskTime(base::TimeTicks start_time,
                                            base::TimeTicks end_time) {
   MainThreadOnly().queueing_time_estimator.OnToplevelTaskCompleted(start_time,
                                                                    end_time);
-  MainThreadOnly().long_task_tracker.RecordLongTask(
-      start_time, end_time - start_time);
   UMA_HISTOGRAM_CUSTOM_COUNTS("RendererScheduler.TaskTime",
                               (end_time - start_time).InMicroseconds(), 1,
                               1000000, 50);
 }
 
-LongTaskTracker::LongTaskTiming RendererSchedulerImpl::GetLongTaskTiming() {
-  return MainThreadOnly().long_task_tracker.GetLongTaskTiming();
+void RendererSchedulerImpl::AddTaskTimeObserver(
+    WebThread::TaskTimeObserver* task_time_observer) {
+    helper_.AddTaskTimeObserver(task_time_observer);
+}
+
+void RendererSchedulerImpl::RemoveTaskTimeObserver(
+    WebThread::TaskTimeObserver* task_time_observer) {
+    helper_.RemoveTaskTimeObserver(task_time_observer);
 }
 
 void RendererSchedulerImpl::OnQueueingTimeForWindowEstimated(
     base::TimeDelta queueing_time) {
   UMA_HISTOGRAM_TIMES("RendererScheduler.ExpectedTaskQueueingDuration",
                       queueing_time);
   TRACE_COUNTER1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                  "estimated_queueing_time_for_window",
                  queueing_time.InMillisecondsF());
 }
@@ skipping 55 matching lines @@
     case v8::PERFORMANCE_LOAD:
       return "load";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink