static TagFiller parseTagParameter(String wrappedParameter, String trimmedParameter) {
        if (trimmedParameter.equals(PARAMETER_TAG)) {
            return new TagFiller(wrappedParameter, trimmedParameter);
        }
        return null;
    }
Try to create a tag filler if the given parameter is a tag parameter.

@return created tag filler, or null if the given parameter is not a tag parameter
android/android_framework/base/src/main/java/com/elvishew/xlog/flattener/PatternFlattener.java