[chromedriver] Apply page load timeout to slow cross-process navigations

chrome/test/chromedriver/net/timeout.h

+// Copyright (c) 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 CHROME_TEST_CHROMEDRIVER_NET_TIMEOUT_H_
+#define CHROME_TEST_CHROMEDRIVER_NET_TIMEOUT_H_
+
+#include "base/time/time.h"
+
+// A helper for tracking the time spent executing a task.  Creating a new
+// instance marks the beginning of the task.  Task duration limit may be set
+// in the contructor or at any time later, but only once.
+class Timeout {
+ public:
+  Timeout();
+  explicit Timeout(const base::TimeDelta& duration);
+
+  // To be used when executing a sub-task with its own timeout, keeping track
+  // of the parent task timeout at the same time. Creates a new Timeout whose
+  // deadline is either Now() + |duration| or deadline of |outer|, whichever is
+  // smaller. |outer| may be nullptr. Note: setting duration on |outer| won't
+  // affect sub-timeouts that were created earlier!
+  Timeout(const base::TimeDelta& duration, const Timeout* outer);
+
+  // Sets the deadline by adding |duration| to the start time recored at
+  // contruction.  Should not be called if the deadline is already set, unless
+  // the duration is exactly the same.
+  void SetDuration(const base::TimeDelta& duration);
+
+  bool is_set() const { return !deadline_.is_null(); }
+
+  // Whether the remaining time delta is less than or equal to zero.
+  bool IsExpired() const;
+
+  // Returns the duration if set, otherwise returns TimeDelta::Max().
+  base::TimeDelta GetDuration() const;
+
+  // Returns the remaining time if duration is set, otherwise returns
+  // TimeDelta::Max().
+  base::TimeDelta GetRemainingTime() const;
+
+ private:
+  base::TimeTicks start_;
+  base::TimeTicks deadline_;
+};
+
+#endif  // CHROME_TEST_CHROMEDRIVER_NET_TIMEOUT_H_