Move Java Blimp shell code to app subpackage

blimp/client/app/android/java/src/org/chromium/blimp/app/BlimpLibraryLoader.java

 // Copyright 2015 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;
+package org.chromium.blimp.app;
 
 import android.os.Handler;
 
 import org.chromium.base.ObserverList;
 import org.chromium.base.ResourceExtractor;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.base.library_loader.LibraryProcessType;
 import org.chromium.base.library_loader.ProcessInitException;
@@ skipping 101 matching lines @@
             public void run() {
                 ThreadUtils.assertOnUiThread();
                 callback.onStartupComplete(sLibraryLoadResult);
             }
         });
     }
 
     // Native methods.
     private static native boolean nativeStartBlimp();
 }