Add correct equality testing for ComputedStyle's StyleVariableData

third_party/WebKit/Source/core/css/CSSVariableData.cpp

Index: third_party/WebKit/Source/core/css/CSSVariableData.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSVariableData.cpp b/third_party/WebKit/Source/core/css/CSSVariableData.cpp
index d5208cba640cd2c897eac596245715c1efe8138b..0e6a310800d40b9f9c7a056f527d35db824556de 100644
--- a/third_party/WebKit/Source/core/css/CSSVariableData.cpp
+++ b/third_party/WebKit/Source/core/css/CSSVariableData.cpp
@@ -27,6 +27,11 @@ template<typename CharacterType> void CSSVariableData::updateTokens(const CSSPar
     ASSERT(currentOffset == m_backingString.getCharacters<CharacterType>() + m_backingString.length());
 }
 
+bool CSSVariableData::operator==(const CSSVariableData& other) const
+{
+    return tokens() == other.tokens();
+}
+
 void CSSVariableData::consumeAndUpdateTokens(const CSSParserTokenRange& range)
 {
     StringBuilder stringBuilder;