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

build/android/finalize_splits_action.gypi

+# Copyright 2015 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 an action to provide an action that
+# signs and zipaligns split APKs.
+#
+# Required variables:
+#  apk_name - Base name of the apk.
+# Optional variables:
+#  density_splits - Whether to process density splits
+#  language_splits - Whether to language splits
+
+{
+  'variables': {
+    'keystore_path%': '<(DEPTH)/build/android/ant/chromium-debug.keystore',
+    'keystore_name%': 'chromiumdebugkey',
+    'keystore_password%': 'chromium',
+    'zipalign_path%': '<(android_sdk_tools)/zipalign',
+    'density_splits%': 0,
+    'language_splits%': [],
+    'resource_packaged_apk_name': '<(apk_name)-resources.ap_',
+    'resource_packaged_apk_path': '<(intermediate_dir)/<(resource_packaged_apk_name)',
+    'base_output_path': '<(PRODUCT_DIR)/apks/<(apk_name)',
+  },
+  'inputs': [
+    '<(DEPTH)/build/android/gyp/finalize_splits.py',
+    '<(DEPTH)/build/android/gyp/finalize_apk.py',
+    '<(DEPTH)/build/android/gyp/util/build_utils.py',
+    '<(keystore_path)',
+  ],
+  'action': [
+    'python', '<(DEPTH)/build/android/gyp/finalize_splits.py',
+    '--resource-packaged-apk-path=<(resource_packaged_apk_path)',
+    '--base-output-path=<(base_output_path)',
+    '--zipalign-path=<(zipalign_path)',
+    '--key-path=<(keystore_path)',
+    '--key-name=<(keystore_name)',
+    '--key-passwd=<(keystore_password)',
+  ],
+  'conditions': [
+    ['density_splits == 1', {
+      'message': 'Signing/aligning <(_target_name) density splits',
+      'inputs': [
+        '<(resource_packaged_apk_path)_hdpi',
+        '<(resource_packaged_apk_path)_xhdpi',
+        '<(resource_packaged_apk_path)_xxhdpi',
+        '<(resource_packaged_apk_path)_xxxhdpi',
+        '<(resource_packaged_apk_path)_tvdpi',
+      ],
+      'outputs': [
+        '<(base_output_path)-density-hdpi.apk',
+        '<(base_output_path)-density-xhdpi.apk',
+        '<(base_output_path)-density-xxhdpi.apk',
+        '<(base_output_path)-density-xxxhdpi.apk',
+        '<(base_output_path)-density-tvdpi.apk',
+      ],
+      'action': [
+        '--densities=hdpi,xhdpi,xxhdpi,xxxhdpi,tvdpi',
+      ],
+    }],
+    ['language_splits != []', {
+      'message': 'Signing/aligning <(_target_name) language splits',
+      'inputs': [
+        "<!@(python <(DEPTH)/build/apply_locales.py '<(resource_packaged_apk_path)_ZZLOCALE' <(language_splits))",
+      ],
+      'outputs': [
+        "<!@(python <(DEPTH)/build/apply_locales.py '<(base_output_path)-lang-ZZLOCALE.apk' <(language_splits))",
+      ],
+      'action': [
+        '--languages=<(language_splits)',
+      ],
+    }],
+  ],
+}
+