CSS Custom Properties (Variables)

Source/core/style/ComputedStyle.h

Index: Source/core/style/ComputedStyle.h
diff --git a/Source/core/style/ComputedStyle.h b/Source/core/style/ComputedStyle.h
index e8f1dd447b7c3da63b8cea7aa1f136bd3b89779c..65f6c576b7390da95cafea3405ffe92ace2b2dd6 100644
--- a/Source/core/style/ComputedStyle.h
+++ b/Source/core/style/ComputedStyle.h
@@ -589,6 +589,11 @@ public:
     TextDecorationStyle textDecorationStyle() const { return static_cast<TextDecorationStyle>(rareNonInheritedData->m_textDecorationStyle); }
     float wordSpacing() const;
     float letterSpacing() const;
+    StyleVariableData* variables() const;
+    void setVariables(PassRefPtr<StyleVariableData>);
+
+    void setVariable(const AtomicString&, PassRefPtr<CSSVariableData>);
+    void removeVariable(const AtomicString&);
 
     float zoom() const { return visual->m_zoom; }
     float effectiveZoom() const { return rareInheritedData->m_effectiveZoom; }
@@ -1702,6 +1707,7 @@ public:
     static TouchAction initialTouchAction() { return TouchActionAuto; }
     static ShadowList* initialBoxShadow() { return 0; }
     static ShadowList* initialTextShadow() { return 0; }
+    static StyleVariableData* initialVariables() { return nullptr; }
     static ScrollBehavior initialScrollBehavior() { return ScrollBehaviorAuto; }
     static ScrollSnapType initialScrollSnapType() { return ScrollSnapTypeNone; }
     static ScrollSnapPoints initialScrollSnapPointsX() { return ScrollSnapPoints(); }