Bindings: Add ScalarValueString support

Source/core/testing/TypeConversions.h

Index: Source/core/testing/TypeConversions.h
diff --git a/Source/core/testing/TypeConversions.h b/Source/core/testing/TypeConversions.h
index ec5dd446780b9da4b1e6ca43f66683f963679ff3..2ccabaaac0c5bd77115aa14f86d03f442084261b 100644
--- a/Source/core/testing/TypeConversions.h
+++ b/Source/core/testing/TypeConversions.h
@@ -62,6 +62,9 @@ public:
     const String& testByteString() const { return m_byteString; }
     void setTestByteString(const String& value) { m_byteString = value; }
 
+    const String& testScalarValueString() const { return m_scalarValueString; }
+    void setTestScalarValueString(const String& value) { m_scalarValueString = value; }
+
     void trace(Visitor*) { }
 
 private:
@@ -78,6 +81,7 @@ private:
     int16_t m_short;
     uint16_t m_unsignedShort;
     String m_byteString;
+    String m_scalarValueString;
 };
 
 } // namespace WebCore