[Typed-OM] Add compound type of CSSVariableReferenceValue and String with some tests

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 d57e1804e09aa777a04b52bbf57cde16072c53e9..9d1a334a4ea4f474fb0c771fda310a3d2444afb1 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/ScriptWrappable.h"
+#include "bindings/core/v8/StringOrCSSVariableReferenceValue.h"
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/css/CSSCustomIdentValue.h"
@@ -19,11 +20,11 @@
 
 namespace blink {
 
-class CORE_EXPORT CSSTokenStreamValue final : public CSSStyleValue, public ValueIterable<String> {
+class CORE_EXPORT CSSTokenStreamValue final : public CSSStyleValue, public ValueIterable<StringOrCSSVariableReferenceValue> {
     WTF_MAKE_NONCOPYABLE(CSSTokenStreamValue);
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static CSSTokenStreamValue* create(const Vector<String>& listOfReferences)
+    static CSSTokenStreamValue* create(const HeapVector<StringOrCSSVariableReferenceValue>& listOfReferences)
     {
         return new CSSTokenStreamValue(listOfReferences);
     }
@@ -32,12 +33,18 @@ public:
 
     StyleValueType type() const override { return TokenStreamType; }
 
-    String referenceAtIndex(int index) { return m_listOfReferences.at(index); }
+    StringOrCSSVariableReferenceValue referenceAtIndex(int index) { return m_listOfReferences.at(index); }
 
     size_t size() { return m_listOfReferences.size(); }
 
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        visitor->trace(m_listOfReferences);
+        CSSStyleValue::trace(visitor);
+    }
+
 protected:
-    CSSTokenStreamValue(Vector<String> listOfReferences)
+    CSSTokenStreamValue(const HeapVector<StringOrCSSVariableReferenceValue>& listOfReferences)
         : CSSStyleValue()
         , m_listOfReferences(listOfReferences)
     {
@@ -46,7 +53,7 @@ protected:
 private:
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 
-    Vector<String> m_listOfReferences;
+    HeapVector<StringOrCSSVariableReferenceValue> m_listOfReferences;
 };
 
 } // namespace blink