Add operator== to CSSTransitionData.

third_party/WebKit/Source/core/animation/css/CSSTransitionData.h

 // Copyright 2014 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 CSSTransitionData_h
 #define CSSTransitionData_h
 
 #include <memory>
 #include "core/CSSPropertyNames.h"
 #include "core/animation/css/CSSTimingData.h"
@@ skipping 41 matching lines @@
 
   static std::unique_ptr<CSSTransitionData> Create() {
     return WTF::WrapUnique(new CSSTransitionData);
   }
 
   std::unique_ptr<CSSTransitionData> Clone() {
     return WTF::WrapUnique(new CSSTransitionData(*this));
   }
 
   bool TransitionsMatchForStyleRecalc(const CSSTransitionData& other) const;
+  bool operator==(const CSSTransitionData& other) const {
+    return TransitionsMatchForStyleRecalc(other);
+  }
 
   Timing ConvertToTiming(size_t index) const;
 
   const Vector<TransitionProperty>& PropertyList() const {
     return property_list_;
   }
   Vector<TransitionProperty>& PropertyList() { return property_list_; }
 
   static TransitionProperty InitialProperty() {
     return TransitionProperty(CSSPropertyAll);
   }
 
  private:
   CSSTransitionData();
   explicit CSSTransitionData(const CSSTransitionData&);
 
   Vector<TransitionProperty> property_list_;
 };
 
 }  // namespace blink
 
 #endif  // CSSTransitionData_h