Support missing and invalid defaults for reflected attributes.

Source/bindings/tests/idls/TestObject.idl

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary formstrArg, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 59 matching lines @@
     [Reflect] attribute boolean reflectedBooleanAttr;
     [Reflect, TreatNullAs=NullString, URL] attribute DOMString reflectedURLAttr;
     [Reflect=customContentStringAttr, TreatNullAs=NullString] attribute DOMString reflectedStringAttr;
     [Reflect=customContentIntegralAttr] attribute long reflectedCustomIntegralAttr;
     [Reflect=customContentBooleanAttr] attribute boolean reflectedCustomBooleanAttr;
     [Reflect=customContentURLAttr, TreatNullAs=NullString, URL] attribute DOMString reflectedCustomURLAttr;
     [Reflect] attribute SVGAnimatedString animatedReflectedAttribute;
     [Reflect, ReflectOnly=unique] attribute DOMString limitedToOnlyOneAttribute;
     [Reflect, ReflectOnly=Per|Paal|Espen] attribute DOMString limitedToOnlyAttribute;
     [Reflect=Other, ReflectOnly=Value1|Value2] attribute DOMString limitedToOnlyOtherAttribute;
+    [Reflect, ReflectOnly=rsa|dsa, ReflectMissing=rsa] attribute DOMString limitedWithMissingDefaultAttribute;
+    [Reflect, ReflectOnly=ltr|rtl|auto, ReflectMissing=auto, ReflectInvalid=ltr] attribute DOMString limitedWithInvalidMissingDefaultAttribute;
+    [Reflect, ReflectOnly=left|right, ReflectMissing=left, ReflectInvalid=left] attribute DOMString limitedWithInvalidAndMissingDefaultAttribute;
 
     // TypedArray attribute
     attribute Float32Array typedArrayAttr;
 
     // Methods
     void    voidMethod();
     void    voidMethodWithArgs(long longArg, DOMString strArg, TestObject objArg);
     long    longMethod();
     long    longMethodWithArgs(long longArg, DOMString strArg, TestObject objArg);
     [MeasureAs=TestFeature] TestObject objMethod();
@@ skipping 217 matching lines @@
     [DeprecateAs=Constant] const unsigned short DEPRECATED_CONSTANT = 1;
 
     // PutForwards
     [PutForwards=href] readonly attribute TestNode location;
     [PutForwards=hrefThrows] readonly attribute TestNode locationWithException;
 };
 
 // The following comment should not generate any code
 // TestObject implements TestImplements;