Don't squash layers that have filters.

LayoutTests/compositing/squashing/no-squashing-for-filters-expected.txt

Index: LayoutTests/compositing/squashing/no-squashing-for-filters-expected.txt
diff --git a/LayoutTests/compositing/squashing/clipping-ancestor-expected.txt b/LayoutTests/compositing/squashing/no-squashing-for-filters-expected.txt
similarity index 60%
copy from LayoutTests/compositing/squashing/clipping-ancestor-expected.txt
copy to LayoutTests/compositing/squashing/no-squashing-for-filters-expected.txt
index 423afafd7904f1960c9f675e20048cf915997bbe..ecd61c4ee4416b8521c0afce399d26e8d96cb97a 100644
--- a/LayoutTests/compositing/squashing/clipping-ancestor-expected.txt
+++ b/LayoutTests/compositing/squashing/no-squashing-for-filters-expected.txt
@@ -8,22 +8,25 @@
       "children": [
         {
           "position": [8, 8],
-          "bounds": [200, 10],
+          "bounds": [100, 100],
+          "contentsOpaque": true,
+          "drawsContent": true,
+          "backgroundColor": "#ADD8E6"
+        },
+        {
           "children": [
             {
-              "bounds": [200, 10],
-              "contentsOpaque": true,
+              "position": [-5, -5],
+              "bounds": [62, 62],
               "drawsContent": true,
-              "backgroundColor": "#F5F5F5"
+              "backgroundColor": "#D3D3D3"
+            },
+            {
+              "position": [50, 50],
+              "bounds": [50, 50],
+              "drawsContent": true
             }
           ]
-        },
-        {
-          "position": [8, 0],
-          "bounds": [100, 100],
-          "contentsOpaque": true,
-          "drawsContent": true,
-          "backgroundColor": "#90EE90"
         }
       ]
     }