Change how version_build_patch is computed to allow PATCH > 255

chrome/chrome_dll.gypi

 # 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.
 {
   'target_defaults': {
     'variables': {
       'chrome_dll_target': 0,
     },
     'target_conditions': [
       ['chrome_dll_target==1', {
@@ skipping 126 matching lines @@
               # a name like "Chromium Framework.framework".
               'product_name': '<(mac_product_name) Framework',
               'mac_bundle': 1,
               'xcode_settings': {
                 'CHROMIUM_BUNDLE_ID': '<(mac_bundle_id)',
 
                 # The dylib versions are of the form a[.b[.c]], where a is a
                 # 16-bit unsigned integer, and b and c are 8-bit unsigned
                 # integers.  Any missing component is taken to be 0.  The
                 # best mapping from product version numbers into this scheme
-                # is to just use the build and patch numbers.  There is no
-                # ambiguity in this scheme because the build number is
-                # guaranteed unique even across distinct major and minor
-                # version numbers.  These settings correspond to
+                # is to just use a=BUILD, b=(PATCH/256), c=(PATCH%256). There
+                # is no ambiguity in this scheme because the build and patch
+                # numbers are guaranteed unique even across distinct major
+                # and minor version numbers.  These settings correspond to
                 # -compatibility_version and -current_version.
-                'DYLIB_COMPATIBILITY_VERSION': '<(version_build_patch)',
-                'DYLIB_CURRENT_VERSION': '<(version_build_patch)',
+                'DYLIB_COMPATIBILITY_VERSION': '<(version_mac_dylib)',
+                'DYLIB_CURRENT_VERSION': '<(version_mac_dylib)',
 
                 # The framework is placed within the .app's versioned
                 # directory.  DYLIB_INSTALL_NAME_BASE and
                 # LD_DYLIB_INSTALL_NAME affect -install_name.
                 'DYLIB_INSTALL_NAME_BASE':
                     '@executable_path/../Versions/<(version_full)',
                 # See tools/build/mac/copy_framework_unversioned for
                 # information on LD_DYLIB_INSTALL_NAME.
                 'LD_DYLIB_INSTALL_NAME':
                     '$(DYLIB_INSTALL_NAME_BASE:standardizepath)/$(WRAPPER_NAME)/$(PRODUCT_NAME)',
@@ skipping 366 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },  # target chrome_dll
       ],
     }],
   ],
 }