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

build/apk_fake_jar.gypi

Index: build/apk_fake_jar.gypi
diff --git a/build/apk_fake_jar.gypi b/build/apk_fake_jar.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..128b84cc2fa2b34ed85defdc014565098101a31d
--- /dev/null
+++ b/build/apk_fake_jar.gypi
@@ -0,0 +1,15 @@
+# Copyright 2013 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.
+
+# This file is meant to be included into a target to provide a rule
+# to build Java in a consistent manner.
+
+{
+  'all_dependent_settings': {
+    'variables': {
+      'input_jars_paths': ['>(apk_output_jar_path)'],
+      'library_dexed_jars_paths': ['>(apk_output_jar_path)'],
+    },
+  },
+}