[CSS Grid Layout] New alignment related repaint layout tests.

LayoutTests/fast/repaint/justify-self-change-keeping-geometry.html

Index: LayoutTests/fast/repaint/justify-self-change-keeping-geometry.html
diff --git a/LayoutTests/fast/repaint/justify-self-change.html b/LayoutTests/fast/repaint/justify-self-change-keeping-geometry.html
similarity index 89%
copy from LayoutTests/fast/repaint/justify-self-change.html
copy to LayoutTests/fast/repaint/justify-self-change-keeping-geometry.html
index c9008050862f7249c3ef7f07cbcfb629d5db1dbc..99d756281f6400583216ddec9f26b95cec17cab5 100644
--- a/LayoutTests/fast/repaint/justify-self-change.html
+++ b/LayoutTests/fast/repaint/justify-self-change-keeping-geometry.html
@@ -2,8 +2,8 @@
 <script src="resources/text-based-repaint.js"></script>
 <script>
 function repaintTest() {
-  document.getElementsByClassName('item1')[0].style.justifySelf = 'start';
-  document.getElementsByClassName('item2')[0].style.justifySelf = 'end';
+  document.getElementsByClassName('item1')[0].style.justifySelf = 'left';
+  document.getElementsByClassName('item2')[0].style.justifySelf = 'right';
 }
 onload = runRepaintTest;
 </script>
@@ -14,7 +14,6 @@ body {
 #container {
   display: grid;
   grid: 100px 100px / 150px 150px;
-  justify-items: center;
   width: 200px;
   height: 300px;
   background-color: red;
@@ -22,15 +21,15 @@ body {
 .item1 {
   grid-row: 1;
   grid-column: 1;
+  justify-self: start;
   background-color: green;
-  border: solid thin blue;
   width: 50px;
 }
 .item2 {
   grid-row: 1;
   grid-column: 2;
+  justify-self: end;
   background-color: green;
-  border: solid thin blue;
   width: 50px;
 </style>
 <p style="height: 20px">Tests invalidation on justify-self style change. Passes if there is no red.</p>