Move Java Blimp shell code to app subpackage

blimp/client/app/android/java/src/org/chromium/blimp/session/EngineInfo.java

-// 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.blimp.session;
-
-/**
- * Stores the information about the engine.
- */
-public class EngineInfo {
-    public final String ipAddress;
-    public final String engineVersion;
-    public final String assignerUrl;
-    private boolean mConnected;
-
-    public EngineInfo(String ip, String version, String assigner) {
-        ipAddress = ip;
-        engineVersion = version;
-        assignerUrl = assigner;
-    }
-
-    public boolean isConnected() {
-        return mConnected;
-    }
-
-    public void setConnected(boolean connected) {
-        this.mConnected = connected;
-    }
-}