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 f3251cdfabd970dc3d83cbe7659421bd8b9ec5ff..a9de9f7ac9545c3266852a1bb69777c03aa0d5f6 100644
--- a/Source/core/css/StyleSheetContents.h
+++ b/Source/core/css/StyleSheetContents.h
@@ -97,6 +97,7 @@ 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();
 
@@ -120,6 +121,7 @@ public:
     StyleRuleBase* ruleAt(unsigned index) const;
 
     bool usesRemUnits() const { return m_usesRemUnits; }
+    bool usesVariables() const { return m_usesVariables; }
 
     unsigned estimatedSizeInBytes() const;
 
@@ -181,6 +183,7 @@ 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;