Bug 1584718 - Add examples with emoji to the segment break transformation reftest. r=m_kato

Differential Revision: https://phabricator.services.mozilla.com/D47905

--HG--
extra : moz-landing-system : lando

layout/reftests/text/segment-break-transformation-1-ref.html

@@ -29,6 +29,11 @@ b { font-weight:normal; background-color:yellow; font-size: 16px; line-height: 1
 <p><b><span>&#x20000;&#x20001;&#x20002;&#x20003;</span></b>
 <p><b><span>&#x20000;&#x6e2c;&#x20002;&#x20003;</span></b>
 <p><b><span>&#x20000;&#x20001;&#x6e2c;&#x20003;</span></b>
+<!-- test emoji handling -->
+<p><b><span>&#x65b7;&#x1f600; &#x6e2c;&#x8a66;</span></b>
+<p><b><span>&#x65b7;&#x884c; &#x1f601;&#x8a66;</span></b>
+<p><b><span>&#x65b7;&#x1f600; &#x1f601;&#x8a66;</span></b>
+<p><b><span>Hello&#x1f600; &#x1f601;Kitty</span></b>
 </div>
 </body>
 </html>

layout/reftests/text/segment-break-transformation-1.html

@@ -45,6 +45,15 @@ Kitty</span></b>
 &#x20002;&#x20003;</span></b>
 <p><b><span>&#x20000;&#x20001;
 &#x6e2c;&#x20003;</span></b>
+<!-- test emoji handling -->
+<p><b><span>&#x65b7;&#x1f600;
+&#x6e2c;&#x8a66;</span></b>
+<p><b><span>&#x65b7;&#x884c;
+&#x1f601;&#x8a66;</span></b>
+<p><b><span>&#x65b7;&#x1f600;
+&#x1f601;&#x8a66;</span></b>
+<p><b><span>Hello&#x1f600;
+&#x1f601;Kitty</span></b>
 </div>
 </body>
 </html>