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

build/android/insert_chromium_version.gypi

+# 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.
+
+# This file is meant to be included into an action to provide a rule that
+# inserts a chromium version string into native libraries.
+#
+# To use this, create a gyp target with the following form:
+#  {
+#    'action_name': 'insert_chromium_version',
+#    'actions': [
+#      'variables': {
+#        'ordered_libraries_file': 'file generated by write_ordered_libraries'
+#        'stripped_libraries_dir': 'the directory contains native libraries'
+#        'input_paths': 'files to be added to the list of inputs'
+#        'stamp': 'file to touch when the action is complete'
+#        'version_string': 'chromium version string to be inserted'
+#      'includes': [ '../../build/android/insert_chromium_version.gypi' ],
+#    ],
+#  },
+#
+
+{
+  'message': 'Inserting chromium version string into native libraries',
+  'variables': {
+    'input_paths': [],
+  },
+  'inputs': [
+    '<(DEPTH)/build/android/gyp/util/build_utils.py',
+    '<(DEPTH)/build/android/gyp/insert_chromium_version.py',
+    '<(ordered_libraries_file)',
+    '>@(input_paths)',
+  ],
+  'outputs': [
+    '<(stamp)',
+  ],
+  'action': [
+    'python', '<(DEPTH)/build/android/gyp/insert_chromium_version.py',
+    '--android-objcopy=<(android_objcopy)',
+    '--stripped-libraries-dir=<(stripped_libraries_dir)',
+    '--libraries=@FileArg(<(ordered_libraries_file):libraries)',
+    '--version-string=<(version_string)',
+    '--stamp=<(stamp)',
+  ],
+  'conditions': [
+    ['component == "shared_library"', {
+      # Add a fake output to force the build to always re-run this step. This
+      # is required because the real inputs are not known at gyp-time and
+      # changing base.so may not trigger changes to dependent libraries.
+      'outputs': [ '<(stamp).fake' ]
+    }],
+  ],
+}