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

build/linux/unbundle/snappy.gyp

Index: build/linux/unbundle/snappy.gyp
diff --git a/build/linux/unbundle/snappy.gyp b/build/linux/unbundle/snappy.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..ab856ed89cb9d21c8b71bb9f1f04a80bb8323d66
--- /dev/null
+++ b/build/linux/unbundle/snappy.gyp
@@ -0,0 +1,29 @@
+# Copyright 2013 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'snappy',
+      'type': 'none',
+      'variables': {
+        'headers_root_path': 'src',
+        'header_filenames': [
+          'snappy-c.h',
+          'snappy-sinksource.h',
+          'snappy-stubs-public.h',
+          'snappy.h',
+        ],
+      },
+      'includes': [
+        '../../build/shim_headers.gypi',
+      ],
+      'link_settings': {
+        'libraries': [
+          '-lsnappy',
+        ],
+      },
+    },
+  ],
+}