Add a Java InterfaceRegistry.

services/shell/public/java/src/org/chromium/services/shell/InterfaceFactory.java

Index: services/shell/public/java/src/org/chromium/services/shell/InterfaceFactory.java
diff --git a/services/shell/public/java/src/org/chromium/services/shell/InterfaceFactory.java b/services/shell/public/java/src/org/chromium/services/shell/InterfaceFactory.java
new file mode 100644
index 0000000000000000000000000000000000000000..8dcf260b73bb75160bb204a52a1b0241b51354fa
--- /dev/null
+++ b/services/shell/public/java/src/org/chromium/services/shell/InterfaceFactory.java
@@ -0,0 +1,19 @@
+// 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.
+
+package org.chromium.services.shell;
+
+import org.chromium.mojo.bindings.Interface;
+
+/**
+ * A factory that creates implementations of a mojo interface.
+ *
+ * @param <I> the mojo interface
+ */
+public interface InterfaceFactory<I extends Interface> {
+    /**
+     * Returns an implementation of the mojo interface.
+     */
+    I createImpl();
+}