IndexedDB: Tests for cursor prefetch edge cases

LayoutTests/storage/indexeddb/prefetch-race-expected.txt

+Ensure IndexedDB's cursor prefetch cache requests are invalidated
+
+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 = "prefetch-race.html"
+indexedDB.deleteDatabase(dbname)
+indexedDB.open(dbname)
+
+prepareDatabase():
+db = event.target.result
+store = db.createObjectStore('store')
+Populate with even records...
+
+onOpenSuccess():
+db = event.target.result
+tx = db.transaction('store', 'readwrite')
+store = tx.objectStore('store')
+request = store.openCursor()
+
+cursorSuccess():
+PASS cursor.key is 0
+cursor.continue()
+
+cursorSuccess():
+PASS cursor.key is 2
+cursor.continue()
+
+cursorSuccess():
+PASS cursor.key is 4
+cursor.continue()
+
+That should have triggered a prefetch, injecting odd records...
+
+cursorSuccess():
+PASS cursor.key is 6
+cursor.continue()
+
+cursorSuccess():
+PASS cursor.key is 7
+cursor.continue()
+
+cursorSuccess():
+PASS cursor.key is 8
+cursor.continue()
+
+cursorSuccess():
+PASS cursor.key is 9
+cursor.continue()
+
+cursorSuccess():
+PASS continueCount is 7
+PASS successfullyParsed is true
+
+TEST COMPLETE
+