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

build/grit_action.gypi

+# Copyright (c) 2011 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 invoke grit in a
+# consistent manner. To use this the following variables need to be
+# defined:
+#   grit_grd_file: string: grd file path
+#   grit_out_dir: string: the output directory path
+
+# It would be really nice to do this with a rule instead of actions, but it
+# would need to determine inputs and outputs via grit_info on a per-file
+# basis. GYP rules don't currently support that. They could be extended to
+# do this, but then every generator would need to be updated to handle this.
+
+{
+  'variables': {
+    'grit_cmd': ['python', '<(DEPTH)/tools/grit/grit.py'],
+    'grit_resource_ids%': '<(DEPTH)/tools/gritsettings/resource_ids',
+    # This makes it possible to add more defines in specific targets,
+    # instead of build/common.gypi .
+    'grit_additional_defines%': [],
+    'grit_rc_header_format%': [],
+    'grit_whitelist%': '',
+
+    'conditions': [
+      # These scripts can skip writing generated files if they are identical
+      # to the already existing files, which avoids further build steps, like
+      # recompilation. However, a dependency (earlier build step) having a
+      # newer timestamp than an output (later build step) confuses some build
+      # systems, so only use this on ninja, which explicitly supports this use
+      # case (gyp turns all actions into ninja restat rules).
+      ['"<(GENERATOR)"=="ninja"', {
+        'write_only_new': '1',
+      }, {
+        'write_only_new': '0',
+      }],
+    ],
+  },
+  'conditions': [
+    ['"<(grit_whitelist)"==""', {
+      'variables': {
+        'grit_whitelist_flag': [],
+      }
+    }, {
+      'variables': {
+        'grit_whitelist_flag': ['-w', '<(grit_whitelist)'],
+      }
+    }]
+  ],
+  'inputs': [
+    '<!@pymod_do_main(grit_info <@(grit_defines) <@(grit_additional_defines) '
+        '<@(grit_whitelist_flag) --inputs <(grit_grd_file) '
+        '-f "<(grit_resource_ids)")',
+  ],
+  'outputs': [
+    '<!@pymod_do_main(grit_info <@(grit_defines) <@(grit_additional_defines) '
+        '<@(grit_whitelist_flag) --outputs \'<(grit_out_dir)\' '
+        '<(grit_grd_file) -f "<(grit_resource_ids)")',
+  ],
+  'action': ['<@(grit_cmd)',
+             '-i', '<(grit_grd_file)', 'build',
+             '-f', '<(grit_resource_ids)',
+             '-o', '<(grit_out_dir)',
+             '--write-only-new=<(write_only_new)',
+             '<@(grit_defines)',
+             '<@(grit_whitelist_flag)',
+             '<@(grit_additional_defines)',
+             '<@(grit_rc_header_format)'],
+  'message': 'Generating resources from <(grit_grd_file)',
+}