Assert event timestamp to be monotonic and not from future

third_party/WebKit/Source/wtf/CurrentTime.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 41 matching lines @@
 WTF_EXPORT double monotonicallyIncreasingTime();
 
 // Same thing, in milliseconds.
 inline double monotonicallyIncreasingTimeMS()
 {
     return monotonicallyIncreasingTime() * 1000.0;
 }
 
 using TimeFunction = double (*)();
 
-// Make all the time functions (currentTime(), monotonicallyIncreasingTime(), systemTraceTime()) return the result
-// of the supplied function. Returns the pointer to the old time function. For both setting and getting, nullptr means
-// using the default timing function returning the actual time.
-WTF_EXPORT TimeFunction setTimeFunctionsForTesting(TimeFunction);
+// Make |currentTime()| function return the result of the supplied function.
+// Returns the pointer to the old time function. For both setting and getting,
+// nullptr means using the default timing function returning the actual time.
+WTF_EXPORT TimeFunction setCurrentTimeFunctionForTesting(TimeFunction);
+
+// Make |monotonicallyIncreasingTime()| function return the result of the
+// supplied function.
+// Returns the pointer to the old time function. For both setting and getting,
+// nullptr means using the default timing function returning the actual time.
+WTF_EXPORT TimeFunction setMonotonicallyIncreasingTimeFunctionForTesting(TimeFunction);
+
 
 } // namespace WTF
 
 using WTF::currentTime;
 using WTF::currentTimeMS;
 using WTF::monotonicallyIncreasingTime;
 using WTF::monotonicallyIncreasingTimeMS;
 using WTF::TimeFunction;
-using WTF::setTimeFunctionsForTesting;
+using WTF::setCurrentTimeFunctionForTesting;
+using WTF::setMonotonicallyIncreasingTimeFunctionForTesting;
 
 #endif // CurrentTime_h