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

build/android/pylib/symbols/PRESUBMIT.py

Index: build/android/pylib/symbols/PRESUBMIT.py
diff --git a/build/android/pylib/symbols/PRESUBMIT.py b/build/android/pylib/symbols/PRESUBMIT.py
new file mode 100644
index 0000000000000000000000000000000000000000..b4d94ae225b02546459fa17c35ddf079f252232b
--- /dev/null
+++ b/build/android/pylib/symbols/PRESUBMIT.py
@@ -0,0 +1,21 @@
+# 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.
+
+def CommonChecks(input_api, output_api):
+  output = []
+  output.extend(input_api.canned_checks.RunPylint(input_api, output_api))
+  output.extend(input_api.canned_checks.RunUnitTestsInDirectory(
+      input_api,
+      output_api,
+      input_api.PresubmitLocalPath(),
+      whitelist=[r'^.+_unittest\.py$']))
+  return output
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return CommonChecks(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return CommonChecks(input_api, output_api)