Provide simple wrappers for base/time types in WTF

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 46 matching lines @@
 }
 
 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);
 
+// Allows wtf/Time.h to use the same mock time function
+WTF_EXPORT TimeFunction getTimeFunctionForTesting();
+
 }  // namespace WTF
 
 using WTF::currentTime;
 using WTF::currentTimeMS;
 using WTF::monotonicallyIncreasingTime;
 using WTF::monotonicallyIncreasingTimeMS;
 using WTF::TimeFunction;
 using WTF::setTimeFunctionsForTesting;
 
 #endif  // CurrentTime_h