Don't repeat header groups when one row of content doesn't fit on the first page

third_party/WebKit/LayoutTests/fragmentation/repeating-thead-exceeds-page-size.html

Index: third_party/WebKit/LayoutTests/fragmentation/repeating-thead-exceeds-page-size.html
diff --git a/third_party/WebKit/LayoutTests/fragmentation/single-line-cells-repeating-thead.html b/third_party/WebKit/LayoutTests/fragmentation/repeating-thead-exceeds-page-size.html
similarity index 61%
copy from third_party/WebKit/LayoutTests/fragmentation/single-line-cells-repeating-thead.html
copy to third_party/WebKit/LayoutTests/fragmentation/repeating-thead-exceeds-page-size.html
index fd02654f2be72865889941b48dc305eeb39e36aa..5a185b29a7861c3ca702699975c4d2b6b91aeb33 100644
--- a/third_party/WebKit/LayoutTests/fragmentation/single-line-cells-repeating-thead.html
+++ b/third_party/WebKit/LayoutTests/fragmentation/repeating-thead-exceeds-page-size.html
@@ -4,23 +4,19 @@ table {
     border-collapse: collapse;
 }
 td, th {
-    background-color: #ddd;
-    border: 1px solid black;
 }
 thead, tr {
     break-inside: avoid;
 }
 </style>
-<p>crbug.com/24826: A table header group repeats on each page.</p>
-<div style="-webkit-columns:3; line-height: 20px; column-fill: auto; height:190px; background-color: yellow;">
-    <table>
-        <thead>
+<p>crbug.com/621258: Drop the repeated header if there isn't room for at least one content row on the page.</p>
+<div style="-webkit-columns:3; line-height: 20px; column-fill: auto; height:190px;">
+    <table id="top">
+        <thead id="top-thead">
             <tr>
-                <th>Col 1</th>
-                <th>Col 2</th>
+                <th><div style="height: 195px;">Col 1</div></th>
             </tr>
         </thead>
-        <tbody>
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
@@ -29,6 +25,7 @@ thead, tr {
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
+        <tr><td class="cell" data-total-y=380>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
@@ -36,15 +33,13 @@ thead, tr {
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
+        <tr><td class="cell" data-total-y=570>Te</td><td>xt</td></tr>
         <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        <tr><td>Te</td><td>xt</td></tr>
-        </tbody>
     </table>
 </div>
+<div id="console"></div>
+<script src="../resources/check-layout.js"></script>
+<script>
+checkLayout(".cell", document.getElementById("console"));
+</script>