Add two more tests to expected gcstress/debug/host failures.

Test: run-libcore-tests
Bug: 161420453
Change-Id: I1add87420ff0bf0986ec0d8e74b5ee33d0765ef4
diff --git a/tools/libcore_gcstress_debug_failures.txt b/tools/libcore_gcstress_debug_failures.txt
index da4d8af..047543d 100644
--- a/tools/libcore_gcstress_debug_failures.txt
+++ b/tools/libcore_gcstress_debug_failures.txt
@@ -37,9 +37,11 @@
           "jsr166.StampedLockTest#testReadLockInterruptibly_Interruptible",
           "jsr166.StampedLockTest#testReadLockInterruptibly",
           "jsr166.StampedLockTest#testWriteLockInterruptibly",
+          "jsr166.TimeUnitTest#testConvert",
           "libcore.java.lang.StringTest#testFastPathString_wellFormedUtf8Sequence",
           "libcore.java.math.BigIntegerTest#test_Constructor_IILjava_util_Random",
           "libcore.java.math.BigIntegerTest#test_probablePrime",
+          "org.apache.harmony.luni.tests.internal.net.www.protocol.http.HttpURLConnectionTest#testUsingProxy",
           "org.apache.harmony.tests.java.lang.ProcessManagerTest#testSleep",
           "org.apache.harmony.tests.java.math.BigIntegerConstructorsTest#testConstructorPrime"
   ]