[Typed-OM] Get CSSTokenStreamValue from StyleMap

third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.h

Index: third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.h
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.h b/third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.h
index cead83b88fe6e72bcd5d408f786c4bb5fb18aef7..2d9a34ffc47d6cd9e05985a1fbba0e5a685b50e6 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.h
+++ b/third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.h
@@ -7,6 +7,7 @@
 
 #include "bindings/core/v8/Iterable.h"
 #include "bindings/core/v8/StringOrCSSVariableReferenceValue.h"
+#include "core/css/CSSVariableReferenceValue.h"
 #include "core/css/cssom/CSSStyleValue.h"
 #include "wtf/Vector.h"
 
@@ -21,6 +22,8 @@ public:
         return new CSSTokenStreamValue(fragments);
     }
 
+    static CSSTokenStreamValue* fromCSSValue(const CSSVariableReferenceValue&);
+
     CSSValue* toCSSValue() const override;
 
     StyleValueType type() const override { return TokenStreamType; }