Index: components/scheduler/renderer/queueing_time_estimator.h |
diff --git a/components/scheduler/renderer/queueing_time_estimator.h b/components/scheduler/renderer/queueing_time_estimator.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..392dbdd718c3786b729541bb50565ba3e27a0650 |
--- /dev/null |
+++ b/components/scheduler/renderer/queueing_time_estimator.h |
@@ -0,0 +1,53 @@ |
+// 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 COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_ |
+#define COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_ |
+ |
+#include "base/macros.h" |
+#include "base/message_loop/message_loop.h" |
+#include "base/time/time.h" |
+#include "cc/base/rolling_time_delta_history.h" |
+#include "components/scheduler/scheduler_export.h" |
+ |
+namespace scheduler { |
+ |
+class CoarseDurationTimer; |
+ |
+// Records the expected queueing time for a high priority task occurring |
+// randomly during each interval of length |window_duration|. |
+class SCHEDULER_EXPORT QueueingTimeEstimator |
+ : public base::MessageLoop::TaskObserver { |
+ public: |
+ class Client { |
+ public: |
+ virtual void OnQueueingTimeForWindowEstimated( |
+ base::TimeDelta queueing_time) = 0; |
+ virtual ~Client() {} |
+ }; |
+ |
+ QueueingTimeEstimator(Client* client, |
+ CoarseDurationTimer* timer, |
+ base::TimeDelta window_duration); |
+ ~QueueingTimeEstimator() override; |
+ |
+ // TaskObserver implementation: |
+ void WillProcessTask(const base::PendingTask& pending_task) override; |
+ void DidProcessTask(const base::PendingTask& pending_task) override; |
+ |
+ private: |
+ Client* client_; // NOT OWNED. |
+ CoarseDurationTimer* timer_; |
+ int outstanding_task_count_; |
+ |
+ base::TimeDelta current_expected_queueing_time_; |
+ base::TimeDelta window_duration_; |
+ base::TimeTicks window_start_time_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(QueueingTimeEstimator); |
+}; |
+ |
+} // namespace scheduler |
+ |
+#endif // COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_ |