Move TouchEvent timeout code to the TouchEventQueue

content/browser/renderer_host/input/timeout_monitor.h

+// Copyright 2013 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_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// Utility class for handling a timeout callback with periodic starts and stops.
+class CONTENT_EXPORT TimeoutMonitor {
+ public:
+  typedef base::Closure TimeoutHandler;
+
+  explicit TimeoutMonitor(const TimeoutHandler& timeout_handler);
+  ~TimeoutMonitor();
+
+  // Schedule the timeout timer to fire at |delay| into the future. If a timeout
+  // has already been scheduled, reschedule only if |delay| is sooner than the
+  // currently scheduled timeout time.
+  void Start(base::TimeDelta delay);
+
+  void Restart(base::TimeDelta delay);
+  void Stop();
+  bool IsRunning() const;
+
+ private:
+  void CheckTimedOut();
+
+  TimeoutHandler timeout_handler_;
+
+  // Indicates a time in the future when we would consider the input as
+  // having timed out, if it does not receive an appropriate stop request.
+  base::Time time_when_considered_timed_out_;
+
+  // This timer runs to check if |time_when_considered_timed_out_| has past.
+  base::OneShotTimer<TimeoutMonitor> timeout_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(TimeoutMonitor);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_