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

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
index 28c8d46d0f3dd7a3c3a816716692095b6a1ab87b..bedca1e75f6e8b15ad1ba825dcc6827874296e83 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
@@ -8,10 +8,8 @@
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
-#include "platform/scheduler/base/long_task_tracker.h"
 #include "platform/scheduler/base/pollable_thread_safe_flag.h"
 #include "platform/scheduler/base/queueing_time_estimator.h"
-#include "platform/scheduler/base/task_time_tracker.h"
 #include "platform/scheduler/base/thread_load_tracker.h"
 #include "platform/scheduler/child/idle_helper.h"
 #include "platform/scheduler/child/scheduler_helper.h"
@@ -23,6 +21,7 @@
 #include "platform/scheduler/renderer/user_model.h"
 #include "platform/scheduler/renderer/web_view_scheduler_impl.h"
 #include "public/platform/scheduler/renderer/renderer_scheduler.h"
+#include "public/platform/scheduler/base/task_time_observer.h"
 
 namespace base {
 namespace trace_event {
@@ -42,7 +41,7 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
       public IdleHelper::Delegate,
       public SchedulerHelper::Observer,
       public RenderWidgetSignals::Observer,
-      public TaskTimeTracker,
+      public TaskTimeObserver,
       public QueueingTimeEstimator::Client {
  public:
   // Keep RendererScheduler::UseCaseToString in sync with this enum.
@@ -131,9 +130,8 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   void OnTriedToExecuteBlockedTask(const TaskQueue& queue,
                                    const base::PendingTask& task) override;
 
-  // TaskTimeTracker implementation:
-  void ReportTaskTime(base::TimeTicks start_time,
-                      base::TimeTicks end_time) override;
+  // TaskTimeObserver implementation:
+  void ReportTaskTime(double start_time, double end_time) override;
 
   // QueueingTimeEstimator::Client implementation:
   void OnQueueingTimeForWindowEstimated(base::TimeDelta queueing_time) override;
@@ -150,7 +148,8 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   void AddWebViewScheduler(WebViewSchedulerImpl* web_view_scheduler);
   void RemoveWebViewScheduler(WebViewSchedulerImpl* web_view_scheduler);
 
-  LongTaskTracker::LongTaskTiming GetLongTaskTiming();
+  void AddTaskTimeObserver(TaskTimeObserver* task_time_observer);
+  void RemoveTaskTimeObserver(TaskTimeObserver* task_time_observer);
 
   // Test helpers.
   SchedulerHelper* GetSchedulerHelperForTesting();
@@ -371,7 +370,6 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
     TaskCostEstimator loading_task_cost_estimator;
     TaskCostEstimator timer_task_cost_estimator;
     QueueingTimeEstimator queueing_time_estimator;
-    LongTaskTracker long_task_tracker;
     IdleTimeEstimator idle_time_estimator;
     ThreadLoadTracker background_main_thread_load_tracker;
     ThreadLoadTracker foreground_main_thread_load_tracker;