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

third_party/WebKit/public/platform/scheduler/child/webthread_base.h

Index: third_party/WebKit/public/platform/scheduler/child/webthread_base.h
diff --git a/third_party/WebKit/public/platform/scheduler/child/webthread_base.h b/third_party/WebKit/public/platform/scheduler/child/webthread_base.h
index 6bfddec80336f03badd23dc4c801e033027a304c..465f9e86c087bba3ede2d7117fdf6077725cf685 100644
--- a/third_party/WebKit/public/platform/scheduler/child/webthread_base.h
+++ b/third_party/WebKit/public/platform/scheduler/child/webthread_base.h
@@ -9,6 +9,7 @@
 #include <memory>
 
 #include "base/threading/thread.h"
+#include "public/platform/scheduler/base/task_time_tracker.h"

[Sami, 2016/08/23 10:34:59]

Ditto about forward declaring.

[panickercorp, 2016/08/23 17:43:31]

Done.

 #include "public/platform/WebCommon.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
@@ -33,6 +34,9 @@ class BLINK_PLATFORM_EXPORT WebThreadBase : public WebThread {
   void addTaskObserver(TaskObserver* observer) override;
   void removeTaskObserver(TaskObserver* observer) override;
 
+  void addTaskTimeTracker(TaskTimeTracker* task_time_tracker) override;
+  void removeTaskTimeTracker(TaskTimeTracker* task_time_tracker) override;
+
   // Returns the base::Bind-compatible task runner for posting tasks to this
   // thread. Can be called from any thread.
   virtual base::SingleThreadTaskRunner* GetTaskRunner() const = 0;
@@ -51,6 +55,9 @@ class BLINK_PLATFORM_EXPORT WebThreadBase : public WebThread {
   virtual void RemoveTaskObserverInternal(
       base::MessageLoop::TaskObserver* observer);
 
+  virtual void AddTaskTimeTrackerInternal(TaskTimeTracker*) {}
+  virtual void RemoveTaskTimeTrackerInternal(TaskTimeTracker*) {}
+
   static void RunWebThreadIdleTask(
       std::unique_ptr<WebThread::IdleTask> idle_task,
       base::TimeTicks deadline);