Assert event timestamp to be monotonic and not from future

third_party/WebKit/Source/wtf/CurrentTime.cpp

 /*
  * Copyright (C) 2009 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "wtf/CurrentTime.h"
 
 #include "base/time/time.h"
 
 namespace WTF {
 
-static TimeFunction mockTimeFunctionForTesting = nullptr;
+static TimeFunction mockCurrentTimeFunction = nullptr;
+static TimeFunction mockMonotonicallyIncreasingTimeFunction = nullptr;
 
 double currentTime()
 {
-    if (mockTimeFunctionForTesting)
-        return mockTimeFunctionForTesting();
+    if (mockCurrentTimeFunction)
+        return mockCurrentTimeFunction();
     return base::Time::Now().ToDoubleT();
 }
 
 double monotonicallyIncreasingTime()
 {
-    if (mockTimeFunctionForTesting)
-        return mockTimeFunctionForTesting();
+    if (mockMonotonicallyIncreasingTimeFunction)
+        return mockMonotonicallyIncreasingTimeFunction();
     return base::TimeTicks::Now().ToInternalValue() / static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
-TimeFunction setTimeFunctionsForTesting(TimeFunction newFunction)
+TimeFunction setCurrentTimeFunctionForTesting(TimeFunction newFunction)
 {
-    TimeFunction oldFunction = mockTimeFunctionForTesting;
-    mockTimeFunctionForTesting = newFunction;
+    TimeFunction oldFunction = mockCurrentTimeFunction;
+    mockCurrentTimeFunction = newFunction;
     return oldFunction;
 }
 
+TimeFunction setMonotonicallyIncreasingTimeFunctionForTesting(TimeFunction newFunction)
+{
+    TimeFunction oldFunction = mockMonotonicallyIncreasingTimeFunction;
+    mockMonotonicallyIncreasingTimeFunction = newFunction;
+    return oldFunction;
+}
+
+
 } // namespace WTF