CSS Custom Properties (Variables)

Source/core/css/resolver/StyleResolverState.cpp

Index: Source/core/css/resolver/StyleResolverState.cpp
diff --git a/Source/core/css/resolver/StyleResolverState.cpp b/Source/core/css/resolver/StyleResolverState.cpp
index d883d7cf5ad09cfa353b0324eff7b2f3fb371b5b..a27c7b5e8849bd3a55a7a1a5fc3941721edb5294 100644
--- a/Source/core/css/resolver/StyleResolverState.cpp
+++ b/Source/core/css/resolver/StyleResolverState.cpp
@@ -23,8 +23,11 @@
 #include "core/css/resolver/StyleResolverState.h"
 
 #include "core/animation/css/CSSAnimations.h"
+#include "core/css/CSSCustomVariableValue.h"
+#include "core/css/resolver/CSSVariableResolver.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeComputedStyle.h"
+#include "core/dom/StyleEngine.h"
 #include "core/frame/FrameHost.h"
 
 namespace blink {
@@ -63,6 +66,11 @@ void StyleResolverState::setAnimationUpdate(PassOwnPtrWillBeRawPtr<CSSAnimationU
     m_animationUpdate = update;
 }
 
+bool StyleResolverState::documentUsesCSSVariables() const
+{
+    return m_document->styleEngine().usesVariables();
+}
+
 PassOwnPtrWillBeRawPtr<CSSAnimationUpdate> StyleResolverState::takeAnimationUpdate()
 {
     return m_animationUpdate.release();