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

build/temp_gyp/pdfsqueeze.gyp

+# Copyright (c) 2009 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': 'pdfsqueeze',
+      'type': 'executable',
+      'sources': [
+        '../../third_party/pdfsqueeze/pdfsqueeze.m',
+      ],
+      'defines': [
+        # Use defines to map the full path names that will be used for
+        # the vars into the short forms expected by pdfsqueeze.m.
+        '______third_party_pdfsqueeze_ApplyGenericRGB_qfilter=ApplyGenericRGB_qfilter',
+        '______third_party_pdfsqueeze_ApplyGenericRGB_qfilter_len=ApplyGenericRGB_qfilter_len',
+      ],
+      'include_dirs': [
+        '<(INTERMEDIATE_DIR)',
+      ],
+      'libraries': [
+        '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
+        '$(SDKROOT)/System/Library/Frameworks/Quartz.framework',
+      ],
+      'actions': [
+        {
+          'action_name': 'Generate inline filter data',
+          'inputs': [
+            '../../third_party/pdfsqueeze/ApplyGenericRGB.qfilter',
+          ],
+          'outputs': [
+            '<(INTERMEDIATE_DIR)/ApplyGenericRGB.h',
+          ],
+          'action': ['xxd', '-i', '<@(_inputs)', '<@(_outputs)'],
+        },
+      ],
+    },
+  ],
+}