Report expected task queueing time via UMA

components/scheduler/base/task_time_tracker.h

+// Copyright 2016 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.
+
+#ifndef CONTENT_RENDERER_SCHEDULER_BASE_TASK_TIME_TRACKER_H_
+#define CONTENT_RENDERER_SCHEDULER_BASE_TASK_TIME_TRACKER_H_
+
+#include "base/time/time.h"
+#include "components/scheduler/scheduler_export.h"
+
+namespace scheduler {
+
+class SCHEDULER_EXPORT TaskTimeTracker {
+ public:
+  virtual void ReportTaskTime(base::TimeTicks startTime,
+                              base::TimeTicks endTime) = 0;
+};

[sdefresne, 2016/07/06 14:51:32]

I think this class needs a virtual destructor too (otherwise you'll call wrong
destructor if you delete a TaskTimeTracker*).

[tdresser, 2016/07/06 15:09:21]

Done.

+
+} // namespace scheduler
+
+#endif // CONTENT_RENDERER_SCHEDULER_BASE_TASK_TIME_TRACKER_H_