Change grid-positioned-items-content-alignment*-001.html to accommoda…

…te platform differences. (#28726)

There is a 0.5 pixel difference on expected data width for some contentSpaceAround tests in grid
among platforms. This change is to accurize the expecting result to 0.5 pixel instead of original 1 pixel.

css/css-grid/abspos/grid-positioned-items-content-alignment-001.html

@@ -306,13 +306,13 @@
 
 <div class="grid contentSpaceAround">
   <div style="grid-column: 2 / auto; grid-row: 2 / auto;"
-    data-offset-x="288" data-offset-y="145" data-expected-width="112" data-expected-height="55">
+    data-offset-x="288" data-offset-y="145" data-expected-width="112.5" data-expected-height="55">
   </div>
 </div>
 
 <div class="grid contentSpaceAround">
   <div class="offsets" style="grid-column: 2 / auto; grid-row: 2 / auto;"
-    data-offset-x="288" data-offset-y="145" data-expected-width="112" data-expected-height="55">
+    data-offset-x="288" data-offset-y="145" data-expected-width="112.5" data-expected-height="55">
   </div>
 </div>
 

css/css-grid/abspos/grid-positioned-items-content-alignment-rtl-001.html

@@ -234,13 +234,13 @@
 
 <div class="grid directionRTL contentSpaceAround">
   <div style="grid-column: auto / 2; grid-row: auto / 2;"
-    data-offset-x="238" data-offset-y="0" data-expected-width="162" data-expected-height="95">
+    data-offset-x="238" data-offset-y="0" data-expected-width="162.5" data-expected-height="95">
   </div>
 </div>
 
 <div class="grid directionRTL contentSpaceAround">
   <div class="offsets" style="grid-column: auto / 2; grid-row: auto / 2;"
-    data-offset-x="238" data-offset-y="0" data-expected-width="162" data-expected-height="95">
+    data-offset-x="238" data-offset-y="0" data-expected-width="162.5" data-expected-height="95">
   </div>
 </div>