Enable slimming paint for fast/repaint

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

Index: LayoutTests/fast/repaint/window-resize-background-image-fixed-centered-composited-expected.txt
diff --git a/LayoutTests/fast/repaint/window-resize-background-image-fixed-centered-composited-expected.txt b/LayoutTests/fast/repaint/window-resize-background-image-fixed-centered-composited-expected.txt
index 516b11feda8d38e6522e2c2c291cb445cd1acebf..79ed8e67acc2addbb63b2bf1e301c3a06c422f32 100644
--- a/LayoutTests/fast/repaint/window-resize-background-image-fixed-centered-composited-expected.txt
+++ b/LayoutTests/fast/repaint/window-resize-background-image-fixed-centered-composited-expected.txt
@@ -5,7 +5,13 @@
       "bounds": [200, 300],
       "drawsContent": true,
       "repaintRects": [
-        [0, 200, 200, 100]
+        [0, 200, 200, 100],
+        [0, 0, 200, 8]
+      ],
+      "paintInvalidationClients": [
+        "VerticalScrollbar",
+        "LayoutView #document",
+        "LayoutBlockFlow HTML"
       ]
     }
   ]
@@ -17,8 +23,17 @@
       "bounds": [300, 300],
       "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"
       ]
     }
   ]
@@ -30,7 +45,12 @@
       "bounds": [300, 250],
       "drawsContent": true,
       "repaintRects": [
-        [0, 250, 300, 50]
+        [0, 250, 300, 50],
+        [0, 0, 300, 8]
+      ],
+      "paintInvalidationClients": [
+        "LayoutView #document",
+        "LayoutBlockFlow HTML"
       ]
     }
   ]
@@ -42,8 +62,16 @@
       "bounds": [250, 250],
       "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"
       ]
     }
   ]