Add a snapshot of flutter/engine/src/build to our sdk

build/android/pylib/remote/device/dummy/BUILD.gn

Index: build/android/pylib/remote/device/dummy/BUILD.gn
diff --git a/build/android/pylib/remote/device/dummy/BUILD.gn b/build/android/pylib/remote/device/dummy/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..54ca275ea3424f05fdac4f58442ad43d7a9ed201
--- /dev/null
+++ b/build/android/pylib/remote/device/dummy/BUILD.gn
@@ -0,0 +1,14 @@
+# 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.
+
+import("//build/config/android/config.gni")
+import("//build/config/android/rules.gni")
+
+# GYP: //build/android/pylib/remote/device/dummy/dummy.gyp:remote_device_dummy_apk
+android_apk("remote_device_dummy_apk") {
+  android_manifest = "//build/android/AndroidManifest.xml"
+  java_files = [ "src/org/chromium/dummy/Dummy.java" ]
+  apk_name = "remote_device_dummy"
+  testonly = true
+}