IDL: Support [DeprecateAs] and [MeasureAs] on constants

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 44 matching lines @@
     const double CONST_VALUE_19 = 4e9;
     const double CONST_VALUE_20 = 3.4e5;
     const double CONST_VALUE_21 = -1.3;
     const double CONST_VALUE_22 = -4e-9;
     const double CONST_VALUE_23 = .123;
     const double CONST_VALUE_24 = 5E+4;
     const float CONST_VALUE_25 = 1;
 
     // Extended attributes
     [DeprecateAs=Constant] const short DEPRECATED_CONSTANT = 1;
+    [MeasureAs=Constant] const short MEASURED_CONSTANT = 1;
     [RuntimeEnabled=FeatureName] const short FEATURE_ENABLED_CONST = 1;
     [Reflect=CONST_IMPL] const short CONST_JAVASCRIPT = 1;
 
     stringifier attribute DOMString stringifierAttribute;
 
     // Attributes
     //
     // Naming convention:
     // [ExtAttr] attribute Type extAttrTypeNameAttribute;
     // E.g.,
@@ skipping 471 matching lines @@
     [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;
 };