Capabilities + Extensions + Cast Host Extension Support for Android client

remoting/android/java/src/org/chromium/chromoting/DummyClientExtension.java

+// Copyright 2014 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.chromoting;
+
+import android.app.Activity;
+
+/**
+ * A dummy implementation of ClientExtension.
+ */
+public class DummyClientExtension implements ClientExtension {
+
+    @Override
+    public String getCapability() {
+        return "";
+    }
+
+    @Override
+    public boolean onExtensionMessage(String type, String data) {
+        return false;
+    }
+
+    @Override
+    public ActivityLifecycleListener onActivityAcceptingListener(Activity activity) {
+        return null;
+    }
+}