解决方法
CSS属性：page-break-inside：avoid;在
HTML tr元素上做到了.
经测试：
wkhtmltopdf 0.12.3为Linux(Ubuntu Trusty)提供32位/ 64位,基于Ubuntu 14.04.2构建,如下所示：
http://wkhtmltopdf.org/downloads.html#stable
快速而肮脏的测试可能如下所示：
<tr style="page-break-inside: avoid;">
<!-- A little border to see the result more easily -->
<td style="border: solid 1px blue;">
Large text possibly displayed on several pages ...
Large text possibly displayed on several pages ...
Large text possibly displayed on several pages ...
Large text possibly displayed on several pages ...
</td>
<td>col2</td>
<td>col3</td>
</tr>
