IDB: Layout test showing ro transactions wait for rw transactions

LayoutTests/storage/indexeddb/transaction-coordination-ro-waits-for-rw-expected.txt

+read-only transaction should see the result of a previous readwrite transaction
+
+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 = "transaction-coordination-ro-waits-for-rw.html"
+indexedDB.deleteDatabase(dbname)
+indexedDB.open(dbname)
+
+prepareDatabase():
+db = event.target.result
+store = db.createObjectStore('store')
+store.put('original value', 'key')
+
+runTransactions():
+db = event.target.result
+transaction1 = db.transaction('store', 'readwrite')
+transaction2 = db.transaction('store', 'readonly')
+request = transaction1.objectStore('store').put('new value', 'key')
+request2 = transaction2.objectStore('store').get('key')
+
+checkResult():
+PASS request2.result is "new value"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+