Add Disconnect menu-item to Android Chromoting client

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

 // Copyright 2013 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;
 import android.content.res.Configuration;
 import android.os.Bundle;
 import android.view.KeyEvent;
@@ skipping 42 matching lines @@
     /** Called whenever an action bar button is pressed. */
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case R.id.actionbar_keyboard:
                 ((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE)).toggleSoftInput(0, 0);
                 return true;
             case R.id.actionbar_hide:
                 getActionBar().hide();
                 return true;
+            case R.id.actionbar_disconnect:
+                JniInterface.disconnectFromHost();
+                return true;
             default:
                 return super.onOptionsItemSelected(item);
         }
     }
 
     /**
      * Called once when a keyboard key is pressed, then again when that same key is released. This
      * is not guaranteed to be notified of all soft keyboard events: certian keyboards might not
      * call it at all, while others might skip it in certain situations (e.g. swipe input).
      */
@@ skipping 19 matching lines @@
                 JniInterface.keyboardAction(KeyEvent.KEYCODE_EQUALS, depressed);
                 break;
             default:
                 // We try to send all other key codes to the host directly.
                 JniInterface.keyboardAction(event.getKeyCode(), depressed);
         }
 
         return super.dispatchKeyEvent(event);
     }
 }