Add MineDigger.apk that works offline

sky/services/viewport/viewport_observer.mojom

 // 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.
 
 module sky;
 
 import "sky/services/viewport/input_event.mojom";
 
 // TODO(eseidel): Rename this interface.
 interface ViewportObserver {
   OnViewportMetricsChanged(int32 width, int32 height, float device_pixel_ratio);
   OnInputEvent(InputEvent event);
 
   RunFromNetwork(string url);
   RunFromFile(string main, string package_root);
-  RunFromSnapshot(string url, handle<data_pipe_consumer> snapshot);
+  RunFromSnapshot(string path);
 };