IDL: Add PropertyBag class

LayoutTests/fast/dom/idl-dictionary-unittest.html

Index: LayoutTests/fast/dom/idl-dictionary-unittest.html
diff --git a/LayoutTests/fast/dom/idl-dictionary-unittest.html b/LayoutTests/fast/dom/idl-dictionary-unittest.html
index b71e1865db3b9e98936a1a8d48df6a4150be2524..178780c5773d6f44041ddefe6f4fd08f07031b5f 100644
--- a/LayoutTests/fast/dom/idl-dictionary-unittest.html
+++ b/LayoutTests/fast/dom/idl-dictionary-unittest.html
@@ -38,10 +38,7 @@ if (window.internals && internals.dictionaryTest) {
     shouldBe('dict.stringSequenceMember', '["foo", "bar", "baz"]');
     debug('');
 
-    // FIXME: Following test doesn't pass. Make it pass.
-/*
     debug('Test for explicit undefined or null, and missing members');
-    dictionaryTest.reset();
     dictionaryTest.set({longMember: undefined, stringMember: undefined,
                         booleanOrNullMember: null});

[haraken, 2014/08/27 16:07:43]

Shall we add a test case to pass undefined to booleanOrNullMember?

Actually we might want to make the test cases more complete. For example:

dictionary InternalDictionary {
  boolean booleanMember;  // test for normal type
  boolean booleanMemberWithDefault = true;  // test for normal type with a
default value
  boolean? booleanOrNullMember;  // test for nullable type
  boolean? booleanOrNullMemberWithDefault = true;  // test for nullable type
with a default value
  long longMember;  // test for other types
  double doubleMember;  // test for other types
  DOMString stringMember;  // test for other types
  sequence<DOMString> stringSequenceMember;  // test for sequence type
  sequence<DOMString>? stringSequenceOrNullMember;  // test for nullable
sequence type
};

Then you can add test cases that pass null, undefined, a normal value or missing
value to each member. You can make the change in a follow-up CL.

[bashi, 2014/08/29 05:21:16]

Done.

     dict = dictionaryTest.get();
@@ -51,7 +48,6 @@ if (window.internals && internals.dictionaryTest) {
     shouldBeUndefined('dict.doubleOrNullMember');
     shouldBeUndefined('dict.stringSequenceMember');
     debug('');
-*/
 
     debug('Test for setting invalid member');
     dictionaryTest.set({invalidMember: 'shouldNotBeSet'});