Merge "Do not enable WAL mode for the WebView database."

                        null);

            }

        }

        mDatabase.enableWriteAheadLogging();

        // mDatabase should not be null,

        // the only case is RequestAPI test has problem to create db

                mDatabase.endTransaction();

            }

        }

        // use per table Mutex lock, turn off database lock, this

        // improves performance as database's ReentrantLock is

        // expansive

        mDatabase.setLockingEnabled(false);

    }

    private static void upgradeDatabase() {