Enable slimming paint for fast/repaint

LayoutTests/fast/repaint/window-resize-background-image-non-fixed-expected.txt

Index: LayoutTests/fast/repaint/window-resize-background-image-non-fixed-expected.txt
diff --git a/LayoutTests/fast/repaint/window-resize-background-image-non-fixed-expected.txt b/LayoutTests/fast/repaint/window-resize-background-image-non-fixed-expected.txt
index e725b19b28b215581bb0e1c15d33813c5ad7cb1c..5dcb69a8b8da631c25ef52f2ae8c3a119113f685 100644
--- a/LayoutTests/fast/repaint/window-resize-background-image-non-fixed-expected.txt
+++ b/LayoutTests/fast/repaint/window-resize-background-image-non-fixed-expected.txt
@@ -6,7 +6,13 @@
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
-        [0, 200, 200, 100]
+        [0, 200, 200, 100],
+        [0, 0, 200, 8]
+      ],
+      "paintInvalidationClients": [
+        "VerticalScrollbar",
+        "LayoutView #document",
+        "LayoutBlockFlow HTML"
       ]
     }
   ]
@@ -19,8 +25,17 @@
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
+        [200, 0, 100, 300],
         [0, 0, 300, 300],
-        [0, 0, 300, 300]
+        [0, 0, 300, 8],
+        [0, 0, 200, 8]
+      ],
+      "paintInvalidationClients": [
+        "HorizontalScrollbar",
+        "LayoutView #document",
+        "LayoutView #document",
+        "LayoutBlockFlow HTML",
+        "LayoutBlockFlow BODY"
       ]
     }
   ]
@@ -33,7 +48,12 @@
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
-        [0, 250, 300, 50]
+        [0, 250, 300, 50],
+        [0, 0, 300, 8]
+      ],
+      "paintInvalidationClients": [
+        "LayoutView #document",
+        "LayoutBlockFlow HTML"
       ]
     }
   ]
@@ -46,8 +66,16 @@
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
+        [250, 0, 50, 250],
+        [0, 0, 300, 8],
         [0, 0, 250, 250],
-        [0, 0, 250, 250]
+        [0, 0, 250, 8]
+      ],
+      "paintInvalidationClients": [
+        "LayoutView #document",
+        "LayoutView #document",
+        "LayoutBlockFlow HTML",
+        "LayoutBlockFlow BODY"
       ]
     }
   ]