🐮 Add dummy junit targets so that GYP & GN have the same targets

testing/android/junit/DummyTest.java

Index: testing/android/junit/DummyTest.java
diff --git a/testing/android/junit/DummyTest.java b/testing/android/junit/DummyTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..8fd9601938b81fd7e6a216b6ab349dcab5e1fc81
--- /dev/null
+++ b/testing/android/junit/DummyTest.java
@@ -0,0 +1,13 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Empty test for GYP compatability. */
+@RunWith(JUnit4.class)
+public class DummyTest {
+    @Test public void foo() {
+    }
+}