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

build/android/pylib/restart_adbd.sh

Index: build/android/pylib/restart_adbd.sh
diff --git a/build/android/pylib/restart_adbd.sh b/build/android/pylib/restart_adbd.sh
new file mode 100755
index 0000000000000000000000000000000000000000..393b2ebac04528d64eb7b5a29f6a2087afcf3a57
--- /dev/null
+++ b/build/android/pylib/restart_adbd.sh
@@ -0,0 +1,20 @@
+#!/system/bin/sh
+
+# Copyright 2014 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.
+
+# Android shell script to restart adbd on the device. This has to be run
+# atomically as a shell script because stopping adbd prevents further commands
+# from running (even if called in the same adb shell).
+
+trap '' HUP
+trap '' TERM
+trap '' PIPE
+
+function restart() {
+  stop adbd
+  start adbd
+}
+
+restart &