Status file update for tests failing on dart2js-drt after chrome roll

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index dbc6e92daf492af3b18ceff883527f16e6326234..9d5ad65fb4126e82c4ef88b040232ed6b1132970 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -2,6 +2,10 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+[ $compiler == dart2js && ($runtime == d8 || $runtime == drt) ]
+convert/chunked_conversion_utf87_test: Pass, Fail # v8 bug: Issue 12293
+typed_data/byte_data_test: Pass, Fail # v8 bug: Issue 12293
+
 [ $compiler == dart2js ]
 math/*: Skip
 mirrors/invoke_test: Fail # Issue 11954