IDL: Add support for serializer definitions

Source/bindings/tests/idls/core/TestObject.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 560 matching lines @@
     [TypeChecking=Interface] void useToImpl4ArgumentsCheckingIfPossibleWithNullableArg(Node node1, Node? node2);
     [TypeChecking=Interface] void useToImpl4ArgumentsCheckingIfPossibleWithUndefinedArg(Node node1, [Default=Undefined] optional Node node2);
     void typeCheckingUnrestrictedVoidMethodFloatArgDoubleArg(float floatArg, double doubleArg);
     [Unforgeable] void unforgeableVoidMethod();
     void voidMethodTestInterfaceGarbageCollectedSequenceArg(sequence<TestInterfaceGarbageCollected> testInterfaceGarbageCollectedSequenceArg);
     void voidMethodTestInterfaceGarbageCollectedArrayArg(TestInterfaceGarbageCollected[] testInterfaceGarbageCollectedArrayArg);
     void voidMethodTestInterfaceWillBeGarbageCollectedSequenceArg(sequence<TestInterfaceWillBeGarbageCollected> testInterfaceWillBeGarbageCollectedSequenceArg);
     void voidMethodTestInterfaceWillBeGarbageCollectedArrayArg(TestInterfaceWillBeGarbageCollected[] testInterfaceWillBeGarbageCollectedArrayArg);
     [NewObject] TestInterface newObjectTestInterfaceMethod();
 
+    serializer DOMString serializerMethod();
+
     // Extended attributes on referenced interfaces
     // (not self; self-reference tests at interface themselves)
     attribute TestInterface testInterfaceAttribute; // [ImplementedAs]
     attribute TestInterfaceGarbageCollected testInterfaceGarbageCollectedAttribute; // [GarbageCollected]
     attribute TestInterfaceGarbageCollected? testInterfaceGarbageCollectedOrNullAttribute; // [GarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected testInterfaceWillBeGarbageCollectedAttribute; // [WillBeGarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected? testInterfaceWillBeGarbageCollectedOrNullAttribute; // [WillBeGarbageCollected]
 
     // Private scripts
     [ImplementedInPrivateScript] void voidMethodImplementedInPrivateScript();
     [ImplementedInPrivateScript] short shortMethodImplementedInPrivateScript();
     [ImplementedInPrivateScript] short shortMethodWithShortArgumentImplementedInPrivateScript(short value);
     [ImplementedInPrivateScript] DOMString stringMethodWithStringArgumentImplementedInPrivateScript(DOMString value);
     [ImplementedInPrivateScript] Node nodeMethodWithNodeArgumentImplementedInPrivateScript(Node value);
     [ImplementedInPrivateScript] Node nodeMethodWithVariousArgumentsImplementedInPrivateScript(Document document, Node node, short value1, double value2, DOMString string);
     [ImplementedInPrivateScript] readonly attribute short readonlyShortAttribute;
     [ImplementedInPrivateScript] attribute short shortAttribute;
     [ImplementedInPrivateScript] attribute DOMString stringAttribute;
     [ImplementedInPrivateScript] attribute Node nodeAttribute;
     [OnlyExposedToPrivateScript] short methodImplementedInCPPForPrivateScriptOnly(short value1, short value2);
     [OnlyExposedToPrivateScript] attribute DOMString attributeImplementedInCPPForPrivateScriptOnly;
     [ImplementedInPrivateScript, OnlyExposedToPrivateScript] short methodForPrivateScriptOnly(short value1, short value2);
     [ImplementedInPrivateScript, OnlyExposedToPrivateScript] attribute DOMString attributeForPrivateScriptOnly;
     [ImplementedInPrivateScript] attribute TestEnum enumForPrivateScript;
 
     maplike<long, DOMStringOrDouble>;
 };