public static int w(String tag, String msg, Throwable tr) {
        if (RePluginInternal.FOR_DEV) {
            return Log.w(TAG_PREFIX + tag, msg, tr);
        }
        return -1;
    }
Send a warning log message and log the exception.

@param tag Used to identify the source of a log message.  It usually identifies
           the class or activity where the log call occurs.
@param msg The message you would like logged.
@param tr  An exception to log
replugin-plugin-library/replugin-plugin-lib/src/main/java/com/qihoo360/replugin/helper/LogDebug.java