Do Keychain reauthorization at update time

chrome/chrome_installer.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'lastchange_path': '<(DEPTH)/build/util/LASTCHANGE',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
   'conditions': [
@@ skipping 876 matching lines @@
         # work properly in a shell script, where ${BUILT_PRODUCTS_DIR} is
         # needed.
         'mac_packaging_sh_dir':
             '${BUILT_PRODUCTS_DIR}/<(mac_product_name) Packaging',
       }, # variables
       'targets': [
         {
           'target_name': 'installer_packaging',
           'type': 'none',
           'dependencies': [
+            'keychain_reauthorize',
             'installer/mac/third_party/bsdiff/goobsdiff.gyp:*',
             'installer/mac/third_party/xz/xz.gyp:*',
           ],
           'conditions': [
             ['buildtype=="Official"', {
               'actions': [
                 {
                   # Create sign.sh, the script that the packaging system will
                   # use to sign the .app bundle.
                   'action_name': 'Make sign.sh',
@@ skipping 24 matching lines @@
           ],  # conditions
           'copies': [
             {
               # Put the files where the packaging system will find them. The
               # packager will use these when building the "full installer"
               # disk images and delta/differential update disk images.
               'destination': '<(mac_packaging_dir)',
               'files': [
                 '<(PRODUCT_DIR)/goobsdiff',
                 '<(PRODUCT_DIR)/goobspatch',
+                '<(PRODUCT_DIR)/keychain_reauthorize',
                 '<(PRODUCT_DIR)/liblzma_decompress.dylib',
                 '<(PRODUCT_DIR)/xz',
                 '<(PRODUCT_DIR)/xzdec',
                 'installer/mac/dirdiffer.sh',
                 'installer/mac/dirpatcher.sh',
                 'installer/mac/dmgdiffer.sh',
                 'installer/mac/pkg-dmg',
               ],
               'conditions': [
                 ['mac_keystone==1', {
@@ skipping 10 matching lines @@
                     'installer/mac/internal/chrome_dmg_background.png',
                     'installer/mac/internal/chrome_dmg_dsstore',
                     'installer/mac/internal/chrome_dmg_icon.icns',
                     'installer/mac/internal/generate_dmgs',
                   ],
                 }],  # branding=="Chrome" and buildtype=="Official"
               ],  # conditions
             },
           ],  # copies
         },  # target: installer_packaging
+        {
+          'target_name': 'keychain_reauthorize',
+          'type': 'executable',
+          'sources': [
+            'installer/mac/keychain_reauthorize_main.cc',
+          ],
+        },  # target: keychain_reauthorize
       ],  # targets
     }],  # OS=="mac"
     [ 'branding == "Chrome"', {
       'variables': {
          'branding_dir': 'app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': 'app/theme/chromium',
       },
     }],
   ],
 }