Add MineDigger.apk that works offline

sky/sdk/example/mine_digger/BUILD.gn

Index: sky/sdk/example/mine_digger/BUILD.gn
diff --git a/services/intent_receiver/BUILD.gn b/sky/sdk/example/mine_digger/BUILD.gn
similarity index 55%
copy from services/intent_receiver/BUILD.gn
copy to sky/sdk/example/mine_digger/BUILD.gn
index 3284567a23d41353c42d3e25f0e28dcedbc7ea30..2af4e13fe491aba0e50c82eb56a04ac85440945f 100644
--- a/services/intent_receiver/BUILD.gn
+++ b/sky/sdk/example/mine_digger/BUILD.gn
@@ -2,10 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//mojo/public/tools/bindings/mojom.gni")
+assert(is_android)
 
-mojom("bindings") {
-  sources = [
-    "intent_receiver.mojom",
-  ]
+import("//sky/apk/rules.gni")
+
+sky_app("mine_digger") {
+  apk_name = "MineDigger"
+  main_dart = "lib/main.dart"
 }