[WIP][NotForLand] IDL dictionary support

LayoutTests/fast/dom/some-dictionary-expected.txt

Index: LayoutTests/fast/dom/some-dictionary-expected.txt
diff --git a/LayoutTests/fast/dom/some-dictionary-expected.txt b/LayoutTests/fast/dom/some-dictionary-expected.txt
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+IDL dictionary example
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS dict.a is undefined.
+PASS dict.b is 2
+PASS dict.stringMember is "doraemon"
+PASS dict.element is null
+PASS dict.a is 3
+PASS dict.b is 2
+PASS dict.stringMember is "mass-produced doraemon"
+PASS dict.element is divElement1
+PASS dict.stringSequenceMember is ["foo", "bar", "baz"]
+PASS dict.elementArrayMember is [divElement1, divElement2]
+PASS dict.invalidMember is undefined.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+