Fix some async repaint tests

LayoutTests/fast/repaint/bugzilla-6473-expected.txt

Index: LayoutTests/fast/repaint/bugzilla-6473-expected.txt
diff --git a/LayoutTests/fast/repaint/bugzilla-6473-expected.txt b/LayoutTests/fast/repaint/bugzilla-6473-expected.txt
index f34ecabcc480e3df52d789417573eda560c91c0f..a45595975f2ca601ffcb6492dd5f570f75a4ee2b 100644
--- a/LayoutTests/fast/repaint/bugzilla-6473-expected.txt
+++ b/LayoutTests/fast/repaint/bugzilla-6473-expected.txt
@@ -5,6 +5,15 @@
       (bounds 800.00 600.00)
       (contentsOpaque 1)
       (drawsContent 1)
+      (repaint rects
+        (rect 8.00 156.00 784.00 32.00)
+        (rect 8.00 156.00 784.00 32.00)
+        (rect 8.00 152.00 784.00 20.00)
+        (rect 8.00 136.00 784.00 52.00)
+        (rect 8.00 136.00 784.00 20.00)
+        (rect 8.00 136.00 784.00 20.00)
+        (rect 0.00 172.00 800.00 24.00)
+      )
     )
   )
 )