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

build/android/rezip.gyp

Index: build/android/rezip.gyp
diff --git a/build/android/rezip.gyp b/build/android/rezip.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..111517763ab19b910738779ca6a5da4296726d2e
--- /dev/null
+++ b/build/android/rezip.gyp
@@ -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.
+
+# Build the rezip build tool.
+{
+  'targets': [
+    {
+      # GN: //build/android/rezip:rezip
+      'target_name': 'rezip_apk_jar',
+      'type': 'none',
+      'variables': {
+        'java_in_dir': 'rezip',
+        'compile_stamp': '<(SHARED_INTERMEDIATE_DIR)/<(_target_name)/compile.stamp',
+        'javac_jar_path': '<(PRODUCT_DIR)/lib.java/rezip_apk.jar',
+      },
+      'actions': [
+        {
+          'action_name': 'javac_<(_target_name)',
+          'message': 'Compiling <(_target_name) java sources',
+          'variables': {
+            'java_sources': ['>!@(find >(java_in_dir) -name "*.java")'],
+          },
+          'inputs': [
+            '<(DEPTH)/build/android/gyp/util/build_utils.py',
+            '<(DEPTH)/build/android/gyp/javac.py',
+            '>@(java_sources)',
+          ],
+          'outputs': [
+            '<(compile_stamp)',
+            '<(javac_jar_path)',
+          ],
+          'action': [
+            'python', '<(DEPTH)/build/android/gyp/javac.py',
+            '--classpath=',
+            '--classes-dir=<(SHARED_INTERMEDIATE_DIR)/<(_target_name)',
+            '--jar-path=<(javac_jar_path)',
+            '--stamp=<(compile_stamp)',
+            '>@(java_sources)',
+          ]
+        },
+      ],
+    }
+  ],
+}