CSS Custom Properties (Variables)

Source/core/dom/StyleEngine.cpp

Index: Source/core/dom/StyleEngine.cpp
diff --git a/Source/core/dom/StyleEngine.cpp b/Source/core/dom/StyleEngine.cpp
index 00bdb5dd32882ac99ba527a64079d8dae445e9cd..7925dedd09ef540c089b3be3a150f7c910a44fbe 100644
--- a/Source/core/dom/StyleEngine.cpp
+++ b/Source/core/dom/StyleEngine.cpp
@@ -61,6 +61,7 @@ StyleEngine::StyleEngine(Document& document)
     , m_usesFirstLineRules(false)
     , m_usesWindowInactiveSelector(false)
     , m_usesRemUnits(false)
+    , m_usesVariables(false)
     , m_maxDirectAdjacentSelectors(0)
     , m_ignorePendingStylesheets(false)
     , m_didCalculateResolver(false)
@@ -336,6 +337,7 @@ void StyleEngine::updateActiveStyleSheets(StyleResolverUpdateMode updateMode)
 
     InspectorInstrumentation::activeStyleSheetsUpdated(m_document);
     m_usesRemUnits = documentStyleSheetCollection()->usesRemUnits();
+    m_usesVariables = documentStyleSheetCollection()->usesVariables();
 
     m_dirtyTreeScopes.clear();
     m_documentScopeDirty = false;