static final long getPersistentCookie() {
        synchronized (COOKIE_LOCK) {
            if (!sPersisistCookieInitialized) {
                sPersisistCookieInitialized = true;
                if (IPC.isPersistentProcess()) {
                    sPersisistCookie = System.currentTimeMillis();
                    if (LOG) {
                        LogDebug.d(PLUGIN_TAG, "generate cookie: " + sPersisistCookie);
                    }
                }
            }
            return sPersisistCookie;
        }
    }
@param plugin
@param process
@param info
@return
replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader2/PluginProcessMain.java