CSS Custom Properties (Variables)

Source/core/css/resolver/StyleResolverState.h

Index: Source/core/css/resolver/StyleResolverState.h
diff --git a/Source/core/css/resolver/StyleResolverState.h b/Source/core/css/resolver/StyleResolverState.h
index a3e013d189c7896de9c3e0518fbb0ccd7d8b72ca..7575e4081f3dcf3c72b250b9d46c86481b375b11 100644
--- a/Source/core/css/resolver/StyleResolverState.h
+++ b/Source/core/css/resolver/StyleResolverState.h
@@ -35,10 +35,12 @@
 #include "core/style/CachedUAStyle.h"
 #include "core/style/ComputedStyle.h"
 #include "core/style/StyleInheritedData.h"
+#include "core/style/StyleVariableData.h"
 
 namespace blink {
 
 class CSSAnimationUpdate;
+class CSSVariableValue;
 class FontDescription;
 
 class StyleResolverState {
@@ -154,6 +156,8 @@ public:
     void setHasDirAutoAttribute(bool value) { m_hasDirAutoAttribute = value; }
     bool hasDirAutoAttribute() const { return m_hasDirAutoAttribute; }
 
+    bool documentUsesCSSVariables() const;
+
 private:
     ElementResolveContext m_elementContext;
     RawPtrWillBeMember<Document> m_document;