IDL: Support default values for dictionary members of union types

Source/bindings/tests/results/modules/UnionTypesModules.h

Index: Source/bindings/tests/results/modules/UnionTypesModules.h
diff --git a/Source/bindings/tests/results/modules/UnionTypesModules.h b/Source/bindings/tests/results/modules/UnionTypesModules.h
index f2fb98bf86ff35c4be67bbe949578f3cbe6426ad..84116568ebe48f18e012d0245d803118fa92fba0 100644
--- a/Source/bindings/tests/results/modules/UnionTypesModules.h
+++ b/Source/bindings/tests/results/modules/UnionTypesModules.h
@@ -25,10 +25,12 @@ public:
     bool isBoolean() const { return m_type == SpecificTypeBoolean; }
     bool getAsBoolean() const;
     void setBoolean(bool);
+    static BooleanOrString fromBoolean(bool);
 
     bool isString() const { return m_type == SpecificTypeString; }
     String getAsString() const;
     void setString(String);
+    static BooleanOrString fromString(String);
 
 private:
     enum SpecificTypes {