mark two tests as slow

BUG=
R=whesse@google.com

Review URL: https://codereview.chromium.org//1346273005 .
diff --git a/.status b/.status
index ebc5f81..059fb47 100644
--- a/.status
+++ b/.status
@@ -10,3 +10,5 @@
 */*/*/*packages/*: Skip
 */*/*/*/*packages/*: Skip
 
+test/sha1_test.dart: Pass, Slow
+test/sha256_test.dart: Pass, Slow