Move paint invalidation after compositing update

LayoutTests/compositing/squashing/add-remove-squashed-layers-expected.txt

Index: LayoutTests/compositing/squashing/add-remove-squashed-layers-expected.txt
diff --git a/LayoutTests/compositing/squashing/add-remove-squashed-layers-expected.txt b/LayoutTests/compositing/squashing/add-remove-squashed-layers-expected.txt
index 83eed584e8853c073e07543c390ef03f312cd6da..f581ab3cda376032f6f00a84ae1ece51fb2306e5 100644
--- a/LayoutTests/compositing/squashing/add-remove-squashed-layers-expected.txt
+++ b/LayoutTests/compositing/squashing/add-remove-squashed-layers-expected.txt
@@ -38,7 +38,6 @@ CASE 2, overlap3 gets added:
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
-        [300, 300, 100, 100],
         [300, 300, 100, 100]
       ],
       "children": [
@@ -57,8 +56,7 @@ CASE 2, overlap3 gets added:
               "drawsContent": true,
               "repaintRects": [
                 [160, 160, 100, 100],
-                [80, 80, 100, 100],
-                [0, 0, 100, 100]
+                [160, 160, 100, 100]
               ]
             }
           ]
@@ -90,7 +88,6 @@ CASE 3, overlap2 gets removed. Since this does not resize the layer, there shoul
               "bounds": [260, 260],
               "drawsContent": true,
               "repaintRects": [
-                [160, 160, 100, 100],
                 [80, 80, 100, 100]
               ]
             }
@@ -125,6 +122,7 @@ CASE 4, overlap1 gets removed:
               "repaintRects": [
                 [160, 160, 100, 100],
                 [0, 0, 100, 100],
+                [0, 0, 100, 100],
                 [0, 0, 100, 100]
               ]
             }
@@ -143,7 +141,6 @@ CASE 5, overlap2 gets added back:
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
-        [220, 220, 100, 100],
         [220, 220, 100, 100]
       ],
       "children": [
@@ -162,6 +159,7 @@ CASE 5, overlap2 gets added back:
               "drawsContent": true,
               "repaintRects": [
                 [80, 80, 100, 100],
+                [80, 80, 100, 100],
                 [0, 0, 100, 100],
                 [0, 0, 100, 100],
                 [0, 0, 100, 100]
@@ -182,7 +180,6 @@ CASE 6, overlap1 gets added back, and overlap3 gets removed:
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
-        [140, 140, 100, 100],
         [140, 140, 100, 100]
       ],
       "children": [
@@ -202,6 +199,7 @@ CASE 6, overlap1 gets added back, and overlap3 gets removed:
               "repaintRects": [
                 [80, 80, 100, 100],
                 [80, 80, 100, 100],
+                [80, 80, 100, 100],
                 [0, 0, 100, 100],
                 [0, 0, 100, 100],
                 [0, 0, 100, 100]