Should not repaint if a CSS property change can be composited

LayoutTests/compositing/repaint/clipping-should-not-repaint-composited-descendants-expected.txt

+(GraphicsLayer
+  (bounds 785.00 621.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 785.00 621.00)
+      (contentsOpaque 1)
+      (drawsContent 1)
+      (children 2
+        (GraphicsLayer
+          (position 108.00 108.00)
+          (bounds 100.00 100.00)
+          (children 1
+            (GraphicsLayer
+              (bounds 100.00 100.00)
+              (children 1
+                (GraphicsLayer
+                  (position -100.00 -100.00)
+                  (bounds 252.00 252.00)
+                  (contentsOpaque 1)
+                  (drawsContent 1)
+                  (backgroundColor #FFFF00)
+                )
+              )
+            )
+          )
+        )
+        (GraphicsLayer
+          (position 108.00 408.00)
+          (bounds 100.00 100.00)
+          (children 1
+            (GraphicsLayer
+              (bounds 100.00 100.00)
+              (children 1
+                (GraphicsLayer
+                  (position -100.00 -100.00)
+                  (bounds 252.00 252.00)
+                  (contentsOpaque 1)
+                  (drawsContent 1)
+                  (backgroundColor #FFFF00)
+                )
+              )
+            )
+          )
+        )
+      )
+    )
+  )
+)
+