Enable slimming paint for fast/repaint

LayoutTests/fast/repaint/overflow-scroll-body-appear-expected.txt

Index: LayoutTests/fast/repaint/overflow-scroll-body-appear-expected.txt
diff --git a/LayoutTests/fast/repaint/overflow-scroll-body-appear-expected.txt b/LayoutTests/fast/repaint/overflow-scroll-body-appear-expected.txt
index eb765637a5bdafcba6e2545beed04c5e2060515e..99322b4f674dc955582975aabda7b6b06d947ba5 100644
--- a/LayoutTests/fast/repaint/overflow-scroll-body-appear-expected.txt
+++ b/LayoutTests/fast/repaint/overflow-scroll-body-appear-expected.txt
@@ -6,8 +6,29 @@
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
+        [8, 50, 784, 18],
+        [8, 50, 769, 18],
+        [8, 16, 2000, 2068],
+        [8, 16, 784, 18],
+        [8, 16, 769, 18],
         [0, 0, 2008, 2092],
         [0, 0, 785, 585]
+      ],
+      "paintInvalidationClients": [
+        "HorizontalScrollbar",
+        "HorizontalScrollbar",
+        "VerticalScrollbar",
+        "RootInlineBox",
+        "InlineTextBox 'You should see both vertical and horizontal scrollbars.'",
+        "RootInlineBox",
+        "InlineTextBox 'This is the test for '",
+        "InlineTextBox 'Bug 36461 - No vertical scrollbar after the CSS class change'",
+        "InlineTextBox '.'",
+        "LayoutView #document",
+        "LayoutView #document",
+        "LayoutBlockFlow BODY",
+        "LayoutBlockFlow P",
+        "LayoutBlockFlow P"
       ]
     }
   ]