css-ruby: Add a test with block fragmentation

Bug: 324111880
Change-Id: I3a35fdae5978e7fb20f24568637999661630b03d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5553173
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1303611}

css/css-ruby/break-within-bases/basic-ref.html

@@ -11,6 +11,15 @@
   word-break: break-all;
   inline-size: 305px;
 }
+.mc {
+  columns: 2 305px;
+  column-gap: 10px;
+  inline-size: 720px;
+  block-size: 80px;
+}
 </style>
 <p>zzz<ruby><span>mmm</span><rt><span>mmmmmm</span></ruby> <ruby><span>mm</span><rt><span>mmmm</span></ruby>zzz
 </p>
+
+<p class="mc">zzz<ruby><span>mmm</span><span>mm</span><rt><span>mmmmmm</span><span>mmmm</span></ruby>zzz
+</p>

css/css-ruby/break-within-bases/basic.html

@@ -13,6 +13,15 @@
   word-break: break-all;
   inline-size: 305px;
 }
+.mc {
+  columns: 2 305px;
+  column-gap: 10px;
+  inline-size: 720px;
+  block-size: 80px;
+}
 </style>
 <p>zzz<ruby><span>mmm</span><span>mm</span><rt><span>mmmmmm</span><span>mmmm</span></ruby>zzz
 </p>
+
+<p class="mc">zzz<ruby><span>mmm</span><span>mm</span><rt><span>mmmmmm</span><span>mmmm</span></ruby>zzz
+</p>