Report expected task queueing time via UMA

components/scheduler/base/test_task_time_tracker.h

Index: components/scheduler/base/test_task_time_tracker.h
diff --git a/components/scheduler/base/test_task_time_tracker.h b/components/scheduler/base/test_task_time_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..7703e8f6975649a6be3a60faba785eb82731d247
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+++ b/components/scheduler/base/test_task_time_tracker.h
@@ -0,0 +1,21 @@
+// 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_TEST_TASK_TIME_TRACKER_H_
+#define CONTENT_RENDERER_SCHEDULER_BASE_TEST_TASK_TIME_TRACKER_H_
+
+#include "base/time/time.h"
+#include "components/scheduler/base/task_time_tracker.h"
+
+namespace scheduler {
+
+class TestTaskTimeTracker : public TaskTimeTracker {
+ public:
+  void ReportTaskTime(base::TimeTicks startTime,
+                      base::TimeTicks endTime) override {}
+};
+
+} // namespace scheduler
+
+#endif // CONTENT_RENDERER_SCHEDULER_BASE_TEST_TASK_TIME_TRACKER_H_