Adding operator== to TimingFunctionTestHelper.

Source/core/platform/animation/TimingFunctionTestHelper.h

 /*
  * Copyright (c) 2013, 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 24 matching lines @@
 
 #ifndef TimingFunctionTestHelper_h
 #define TimingFunctionTestHelper_h
 
 #include "core/platform/animation/TimingFunction.h"
 
 #include <ostream> // NOLINT
 
 namespace WebCore {
 
+// PrintTo functions
 void PrintTo(const LinearTimingFunction&, ::std::ostream*);
 void PrintTo(const CubicBezierTimingFunction&, ::std::ostream*);
 void PrintTo(const StepsTimingFunction&, ::std::ostream*);
 void PrintTo(const ChainedTimingFunction&, ::std::ostream*);
 void PrintTo(const TimingFunction&, ::std::ostream*);
 
+// operator== functions
+bool operator==(const LinearTimingFunction&, const TimingFunction&);
+bool operator==(const CubicBezierTimingFunction&, const TimingFunction&);
+bool operator==(const StepsTimingFunction&, const TimingFunction&);
+bool operator==(const ChainedTimingFunction&, const TimingFunction&);
+
+bool operator==(const TimingFunction&, const TimingFunction&);
+bool operator!=(const TimingFunction&, const TimingFunction&);
+
 } // namespace WebCore
 
 #endif