Fix clipping of content outside the bounds of the window.

sky/tests/clipping/clipping-transforms-expected.sky

Index: sky/tests/clipping/clipping-transforms-expected.sky
diff --git a/sky/tests/lowlevel/filters-expected.sky b/sky/tests/clipping/clipping-transforms-expected.sky
similarity index 70%
copy from sky/tests/lowlevel/filters-expected.sky
copy to sky/tests/clipping/clipping-transforms-expected.sky
index 34757d00717860359561aa2e3c92d11d9623128f..4ac45d7af6c0c2557dfb82d88662547169456755 100644
--- a/sky/tests/lowlevel/filters-expected.sky
+++ b/sky/tests/clipping/clipping-transforms-expected.sky
@@ -1,8 +1,5 @@
-<foo>
 <import src="../resources/run-after-display.sky" />
-
-<img src="http://storage.googleapis.com/mojo/sky-pngs/9a7b59f74e2bbcd0d0ceee17ead05b0da64a2af7" />
-
+<img src="http://storage.googleapis.com/mojo/sky-pngs/77c37e9285340992042008792e29c861306cdc9e" />
 <script>
 import "dart:sky";
 import "dart:sky.internals" as internals;
@@ -15,4 +12,3 @@ void main() {
   });
 }
 </script>
-</foo>