Add operator== to CSSTransitionData.

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

Index: third_party/WebKit/Source/core/animation/css/CSSTransitionData.h
diff --git a/third_party/WebKit/Source/core/animation/css/CSSTransitionData.h b/third_party/WebKit/Source/core/animation/css/CSSTransitionData.h
index 5bbac4fb0768ada677f736b45c11dbeb40db2465..6ccd8da484d8bf4c35646202d119c975f7307fc0 100644
--- a/third_party/WebKit/Source/core/animation/css/CSSTransitionData.h
+++ b/third_party/WebKit/Source/core/animation/css/CSSTransitionData.h
@@ -59,6 +59,9 @@ class CSSTransitionData final : public CSSTimingData {
   }
 
   bool TransitionsMatchForStyleRecalc(const CSSTransitionData& other) const;
+  bool operator==(const CSSTransitionData& other) const {
+    return TransitionsMatchForStyleRecalc(other);
+  }
 
   Timing ConvertToTiming(size_t index) const;