Added support for layout render tests. These use expected values for the text render output from Du…

pkg/pkg.status

Index: pkg/pkg.status
===================================================================
--- pkg/pkg.status	(revision 11963)
+++ pkg/pkg.status	(working copy)
@@ -45,9 +45,6 @@
 intl/test/intl_test: Fail
 intl/test/number_format_test: Fail
 logging/test/logging_test: Fail
-unittest/test/matchers_test: Fail
-unittest/test/mock_test: Fail
-unittest/test/unittest_test: Fail
 args/test/args_test: Fail
 intl/test/bidi_format_test: Fail
 intl/test/bidi_utils_test: Fail
@@ -58,5 +55,7 @@
 logging/test/logging_test: Fail
 unittest/test/matchers_test: Fail
 unittest/test/mock_test: Fail
-unittest/test/unittest_test: Fail
 yaml_test: Fail
+
+[ $compiler == dart2js && $runtime == d8 && $checked ]
+unittest/test/unittest_test: Fail