Add 'arch' field to Mac files list for consistency on all platforms.

chrome/tools/build/mac/FILES.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # Copyright (c) 2010 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 is a buildbot configuration file containing a tagged list of files
 # processed by the stage/archive scripts. The known tags are:
 #
 # filename: Name of the file in the build output directory.
+# arch:     List of CPU architectures for which this file should be processed
+#           (values are based on the strings returned by python's
+#           platform.architecture() function).
+#           Note: Mac doesn't really care about 'arch' (like Linux does)
+#           because binaries are packaged to support multiple architectures,
+#           but we still tag the files to allow consistent handling in the
+#           buildbot scripts. Tagging them all as both 32bit and 64bit is the
+#           safest bet.
 # buildtype: List of build types for which this file should be processed.
-#
-# Note, Mac doesn't tag FILES with 'arch' (like Linux does) because binaries
-# are packaged to support multiple architectures.
 
 FILES = [
   {
     'filename': 'Chromium.app',
+    'arch': ['32bit', '64bit'],
     'buildtype': ['dev'],
   },
   {
     'filename': 'Google Chrome.app',
+    'arch': ['32bit', '64bit'],
     'buildtype': ['official'],
   },
   {
     'filename': 'Google Chrome Packaging',
+    'arch': ['32bit', '64bit'],
     'buildtype': ['official'],
   },
   # Remoting Host plugin files:
   {
     'filename': 'remoting_host_plugin.plugin',
+    'arch': ['32bit', '64bit'],
     'buildtype': ['dev', 'official'],
   },
 ]