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

build/android/pylib/local/local_test_server_spawner.py

Index: build/android/pylib/local/local_test_server_spawner.py
diff --git a/build/android/pylib/local/local_test_server_spawner.py b/build/android/pylib/local/local_test_server_spawner.py
new file mode 100644
index 0000000000000000000000000000000000000000..77f552e8d5c288053f503a2b2ccbdb75c089721b
--- /dev/null
+++ b/build/android/pylib/local/local_test_server_spawner.py
@@ -0,0 +1,45 @@
+# 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.
+
+from pylib import chrome_test_server_spawner
+from pylib import forwarder
+from pylib.base import test_server
+
+
+class LocalTestServerSpawner(test_server.TestServer):
+
+  def __init__(self, port, device, tool):
+    super(LocalTestServerSpawner, self).__init__()
+    self._device = device
+    self._spawning_server = chrome_test_server_spawner.SpawningServer(
+        port, device, tool)
+    self._tool = tool
+
+  @property
+  def server_address(self):
+    return self._spawning_server.server.server_address
+
+  @property
+  def port(self):
+    return self.server_address[1]
+
+  #override
+  def SetUp(self):
+    self._device.WriteFile(
+        '%s/net-test-server-ports' % self._device.GetExternalStoragePath(),
+        '%s:0' % str(self.port))
+    forwarder.Forwarder.Map(
+        [(self.port, self.port)], self._device, self._tool)
+    self._spawning_server.Start()
+
+  #override
+  def Reset(self):
+    self._spawning_server.CleanupState()
+
+  #override
+  def TearDown(self):
+    self.Reset()
+    self._spawning_server.Stop()
+    forwarder.Forwarder.UnmapDevicePort(self.port, self._device)
+