CSS Custom Properties (Variables)

Source/core/css/StyleSheetContents.h

Index: Source/core/css/StyleSheetContents.h
diff --git a/Source/core/css/StyleSheetContents.h b/Source/core/css/StyleSheetContents.h
index c07f12fe20e982bac1ab4f7ae5d64473a89fe1fd..adac276bf2c05ba1fa608186727d47fb5febf172 100644
--- a/Source/core/css/StyleSheetContents.h
+++ b/Source/core/css/StyleSheetContents.h
@@ -99,6 +99,7 @@ public:
     void parserAddNamespace(const AtomicString& prefix, const AtomicString& uri);
     void parserAppendRule(PassRefPtrWillBeRawPtr<StyleRuleBase>);
     void parserSetUsesRemUnits(bool b) { m_usesRemUnits = b; }
+    void parserSetUsesVariables(bool b) { m_usesVariables = b; }
 
     void clearRules();
 
@@ -122,6 +123,7 @@ public:
     StyleRuleBase* ruleAt(unsigned index) const;
 
     bool usesRemUnits() const { return m_usesRemUnits; }
+    bool usesVariables() const { return m_usesVariables; }
 
     unsigned estimatedSizeInBytes() const;
 
@@ -184,6 +186,7 @@ private:
     bool m_hasSyntacticallyValidCSSHeader : 1;
     bool m_didLoadErrorOccur : 1;
     bool m_usesRemUnits : 1;
+    bool m_usesVariables : 1;
     bool m_isMutable : 1;
     bool m_isInMemoryCache : 1;
     bool m_hasFontFaceRule : 1;