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

build/android/rezip/BUILD.gn

Index: build/android/rezip/BUILD.gn
diff --git a/build/android/rezip/BUILD.gn b/build/android/rezip/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..8b8f78e875133e1195f4985a4dfcbb431cb044f2
--- /dev/null
+++ b/build/android/rezip/BUILD.gn
@@ -0,0 +1,11 @@
+# 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.
+
+import("//build/config/android/rules.gni")
+
+# GYP: //build/android/rezip.gyp:rezip_apk_jar
+java_library("rezip") {
+  jar_path = "$root_build_dir/lib.java/rezip_apk.jar"
+  DEPRECATED_java_in_dir = "."
+}