Test for prefetch cache resetting on IDBObjectStore.clear()

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

+Ensure IndexedDB's write operations invalidate cursor prefetch caches
+
+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-invalidation.html"
+indexedDB.deleteDatabase(dbname)
+indexedDB.open(dbname)
+
+prepareDatabase():
+db = event.target.result
+store = db.createObjectStore('store')
+
+onOpenSuccess():
+db = event.target.result
+
+-------------------------------------------
+
+doPrefetchInvalidationTest():
+store = db.transaction('store', 'readwrite').objectStore('store')
+Populate the store with 200 records.
+cursorRequest = store.openCursor()
+
+continue100Times():
+PASS cursorRequest.result is non-null.
+
+doOperationAndContinue():
+store.delete(IDBKeyRange.bound(-Infinity, +Infinity))
+cursor = cursorRequest.result
+cursor.continue()
+
+onContinueSuccess():
+PASS cursorRequest.result is null
+
+-------------------------------------------
+
+doPrefetchInvalidationTest():
+store = db.transaction('store', 'readwrite').objectStore('store')
+Populate the store with 200 records.
+cursorRequest = store.openCursor()
+
+continue100Times():
+PASS cursorRequest.result is non-null.
+
+doOperationAndContinue():
+store.clear()
+cursor = cursorRequest.result
+cursor.continue()
+
+onContinueSuccess():
+PASS cursorRequest.result is null
+PASS successfullyParsed is true
+
+TEST COMPLETE
+