[Mac/GN] Get chrome and chrome_framework building.

build/util/version.gni

 # 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 exposes the Chrome version as GN variables for use in build files.
 #
 # PREFER NOT TO USE THESE. The GYP build uses this kind of thing extensively.
 # However, it is far better to write an action (or use the process_version
 # wrapper in chrome/version.gni) to generate a file at build-time with the
 # information you need. This allows better dependency checking and GN will
@@ skipping 27 matching lines @@
 
 # Full version. For example "45.0.12321.0"
 chrome_version_full = _result.full
 
 # The consituent parts of the full version.
 chrome_version_major = _result.major
 chrome_version_minor = _result.minor
 chrome_version_build = _result.build
 chrome_version_patch = _result.patch
 remoting_version_patch = _result.remoting
+
+if (is_mac) {
+  _result = exec_script("version.py",
+                        [
+                          "-f",
+                          rebase_path(chrome_version_file, root_build_dir),
+                          "-t",
+                          "@BUILD@.@PATCH_HI@.@PATCH_LO@",
+                          "-e",
+                          "PATCH_HI=int(PATCH)/256",
+                          "-e",
+                          "PATCH_LO=int(PATCH)%256",
+                        ],
+                        "trim string",
+                        [ chrome_version_file ])
+  chrome_dylib_version = _result
+}