bindings: Add validation for enum Sequence or Array

LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt

Index: LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
diff --git a/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt b/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
index 227fed5cc55792bedf169e52bb3088a4708b3f96..3fcfdd9e62c76850087c645d5c73fa31d272a0d9 100644
--- a/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
+++ b/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
@@ -21,6 +21,7 @@ PASS dict.stringSequenceOrNullMember is undefined.
 PASS dict.elementMember is undefined.
 PASS dict.elementOrNullMember is undefined.
 PASS dict.enumMember is undefined.
+PASS dict.enumArrayMember is undefined.
 PASS dict.enumMemberWithDefault is "foo"
 PASS dict.enumOrNullMember is undefined.
 PASS dict.objectMember is undefined.
@@ -67,6 +68,7 @@ PASS dict.elementOrNullMember is undefined.
 PASS dict.enumMember is "foo"
 PASS dict.enumMemberWithDefault is "bar"
 PASS dict.enumOrNullMember is "baz"
+PASS dict.enumArrayMember is ["foo", "bar", "baz"]
 PASS dict.objectMember is testObject1
 PASS dict.objectOrNullMemberWithDefault is testObject2
 PASS dict.doubleOrStringMember is 3.14
@@ -100,7 +102,8 @@ PASS dictionaryTest.set({byteStringMember: 'Ā'}) threw exception TypeError: Fai
 Test for setting invalid USVString value
 PASS dict.usvStringMember is "_�_�_��_"
 Test for setting invalid enum value
-PASS dictionaryTest.set({enumMember: 'invalid'}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member enumMember ('invalid') is not a valid enum value..
+PASS dictionaryTest.set({enumMember: 'invalid'}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': The provided value 'invalid' is not a valid enum value..
+PASS dictionaryTest.set({enumArrayMember: ['foo', 'invalid', 'baz']}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': The provided value 'invalid' is not a valid enum value..
 
 Test for setting invalid object value
 PASS dictionaryTest.set({objectMember: 42}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member objectMember is not an object..