ART: Extend run-test 068-classloader

Add code that tries to provoke dex-cache collisions.

Change-Id: I58c7905597a501f3731efe4c6e1e2f7772e3b312
diff --git a/test/068-classloader/src-ex/Mutator.java b/test/068-classloader/src-ex/Mutator.java
new file mode 100644
index 0000000..6bcd5b8
--- /dev/null
+++ b/test/068-classloader/src-ex/Mutator.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Simple mutator to change a static field of the mutator target. This will require a dex-cache
+ * access, so this setup allows the correct disambiguation between multiple class-loaders.
+ */
+public class Mutator {
+    public static void mutate(int v) {
+        MutationTarget.value = v;
+    }
+}
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