bindings: Add validation for enum Sequence or Array

LayoutTests/storage/indexeddb/objectstore-keycursor-expected.txt

 Test IndexedDB's objectStore.openKeyCursor + the cursor it produces in depth.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
 
 dbname = "objectstore-keycursor.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
 objectStore = db.createObjectStore('someObjectStore')
 
 Verify that specifying an invalid direction raises an exception:
 Expecting TypeError exception from objectStore.openKeyCursor(0, 'invalid-direction')
 PASS Exception was thrown.
-PASS objectStore.openKeyCursor(0, 'invalid-direction') threw TypeError: Failed to execute 'openKeyCursor' on 'IDBObjectStore': parameter 2 ('invalid-direction') is not a valid enum value.
+PASS objectStore.openKeyCursor(0, 'invalid-direction') threw TypeError: Failed to execute 'openKeyCursor' on 'IDBObjectStore': The provided value 'invalid-direction' is not a valid enum value.
 
 objectStore.add('', testData[nextToAdd])
 objectStore.add('', testData[nextToAdd])
 objectStore.add('', testData[nextToAdd])
 objectStore.add('', testData[nextToAdd])
 objectStore.add('', testData[nextToAdd])
 objectStore.add('', testData[nextToAdd])
 Scheduling tests...
 Running tests...
 
@@ skipping 299 matching lines @@
 PASS event.target.result.key is testData[4]
 PASS event.target.result.key is testData[3]
 PASS event.target.result.key is testData[2]
 PASS event.target.result.key is testData[1]
 PASS event.target.result.key is testData[0]
 PASS event.target.result is null
 PASS successfullyParsed is true
 
 TEST COMPLETE