Add correct equality testing for ComputedStyle's StyleVariableData

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

 // Copyright 2015 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.
 
 #include "config.h"
 #include "core/css/CSSVariableData.h"
 
 #include "core/css/parser/CSSParserTokenRange.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 template<typename CharacterType> void CSSVariableData::updateTokens(const CSSParserTokenRange& range)
 {
     const CharacterType* currentOffset = m_backingString.getCharacters<CharacterType>();
     for (const CSSParserToken& token : range) {
         if (token.hasStringBacking()) {
             unsigned length = token.value().length();
             CSSParserString parserString;
             parserString.init(currentOffset, length);
             m_tokens.append(token.copyWithUpdatedString(parserString));
             currentOffset += length;
         } else {
             m_tokens.append(token);
         }
     }
     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;
     CSSParserTokenRange localRange = range;
 
     while (!localRange.atEnd()) {
         CSSParserToken token = localRange.consume();
         if (token.hasStringBacking()) {
             CSSParserString value = token.value();
             if (value.is8Bit())
@@ skipping 10 matching lines @@
 }
 
 CSSVariableData::CSSVariableData(const CSSParserTokenRange& range, bool needsVariableResolution)
     : m_needsVariableResolution(needsVariableResolution)
 {
     ASSERT(!range.atEnd());
     consumeAndUpdateTokens(range);
 }
 
 } // namespace blink