Blacklist test now timing out on gcstress/target.

Started happening in the same build as:

- interpreter switch refactoring:
https://android.googlesource.com/platform/art/+/b70c999fcc3ff4d4988e0214f4d18783ff35edf7

- R8 drop:
https://android.googlesource.com/platform/prebuilts%2Fr8/+/3f5cf1c79d98d7c2c5ee1da046cd2a028eb835e9

Test: run-libcore-tests.sh
Change-Id: I50651638d8e995acd7ff58c823ea7cd784d9cf77
diff --git a/tools/libcore_gcstress_failures.txt b/tools/libcore_gcstress_failures.txt
index fff1c70..eec45fa 100644
--- a/tools/libcore_gcstress_failures.txt
+++ b/tools/libcore_gcstress_failures.txt
@@ -27,12 +27,14 @@
   description: "Timeouts.",
   result: EXEC_FAILED,
   modes: [device],
-  names: ["libcore.java.lang.StringTest#testFastPathString_wellFormedUtf8Sequence",
+  names: ["jsr166.TimeUnitTest#testConvert",
+          "libcore.java.lang.StringTest#testFastPathString_wellFormedUtf8Sequence",
+          "libcore.java.text.DecimalFormatTest#testCurrencySymbolSpacing",
+          "libcore.java.text.SimpleDateFormatTest#testLocales",
           "org.apache.harmony.tests.java.lang.ref.ReferenceQueueTest#test_remove",
           "org.apache.harmony.tests.java.text.DateFormatTest#test_getAvailableLocales",
+          "org.apache.harmony.tests.java.lang.String2Test#test_getBytes",
           "org.apache.harmony.tests.java.util.TimerTest#testOverdueTaskExecutesImmediately",
-          "org.apache.harmony.tests.java.util.WeakHashMapTest#test_keySet_hasNext",
-          "libcore.java.text.DecimalFormatTest#testCurrencySymbolSpacing",
-          "libcore.java.text.SimpleDateFormatTest#testLocales"]
+          "org.apache.harmony.tests.java.util.WeakHashMapTest#test_keySet_hasNext"]
 }
 ]