Layer squashing causes incorrect rendering while scrolling in Gmail

LayoutTests/compositing/squashing/composited-bounds-for-negative-z-expected.txt

Index: LayoutTests/compositing/squashing/composited-bounds-for-negative-z-expected.txt
diff --git a/LayoutTests/css3/compositing/mix-blend-mode-isolation-2-stacking-contexts-expected.txt b/LayoutTests/compositing/squashing/composited-bounds-for-negative-z-expected.txt
similarity index 50%
copy from LayoutTests/css3/compositing/mix-blend-mode-isolation-2-stacking-contexts-expected.txt
copy to LayoutTests/compositing/squashing/composited-bounds-for-negative-z-expected.txt
index bfe2d8e189f4f9754c330faf414802911f60fd2a..b78b91b74c7955f0485341ac006c99e0b5be4a2f 100644
--- a/LayoutTests/css3/compositing/mix-blend-mode-isolation-2-stacking-contexts-expected.txt
+++ b/LayoutTests/compositing/squashing/composited-bounds-for-negative-z-expected.txt
@@ -6,61 +6,53 @@
       (contentsOpaque 1)
       (children 1
         (GraphicsLayer
-          (bounds 800.00 600.00)
+          (bounds 800.00 408.00)
           (drawsContent 1)
-          (children 3
+          (children 4
             (GraphicsLayer
-              (position 8.00 8.00)
+              (position 8.00 100.00)
+              (bounds 10.00 10.00)
               (contentsOpaque 1)
               (drawsContent 1)
               (backgroundColor #FF0000)
+            )
+            (GraphicsLayer
+              (bounds 800.00 408.00)
+              (drawsContent 1)
+            )
+            (GraphicsLayer
+              (position 108.00 100.00)
+              (bounds 300.00 300.00)
               (children 2
                 (GraphicsLayer
-                  (bounds 160.00 90.00)
-                  (isolate 1)
-                  (contentsOpaque 1)
-                  (drawsContent 1)
-                  (backgroundColor #008000)
+                  (bounds 285.00 300.00)
                   (children 1
                     (GraphicsLayer
-                      (bounds 160.00 90.00)
-                      (blendMode multiply)
+                      (bounds 285.00 1000.00)
+                      (shouldFlattenTransform 0)
                     )
                   )
                 )
                 (GraphicsLayer
+                  (position 285.00 0.00)
+                  (bounds 15.00 300.00)
                   (drawsContent 1)
                 )
               )
             )
             (GraphicsLayer
-              (position 8.00 8.00)
-              (contentsOpaque 1)
-              (drawsContent 1)
-              (backgroundColor #FF0000)
               (children 2
                 (GraphicsLayer
-                  (bounds 160.00 90.00)
-                  (isolate 1)
-                  (contentsOpaque 1)
-                  (drawsContent 1)
-                  (backgroundColor #008000)
-                  (children 1
-                    (GraphicsLayer
-                      (bounds 160.00 90.00)
-                      (blendMode multiply)
-                    )
-                  )
+                  (position 108.00 100.00)
+                  (bounds 285.00 1000.00)
                 )
                 (GraphicsLayer
+                  (position 108.00 100.00)
+                  (bounds 285.00 1000.00)
                   (drawsContent 1)
                 )
               )
             )
-            (GraphicsLayer
-              (bounds 800.00 600.00)
-              (drawsContent 1)
-            )
           )
         )
       )