Build official release builds on Mac with ASAN. Not for check-in

ppapi/native_client/src/trusted/plugin/plugin.gyp

 # -*- python -*-
 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     'plugin.gypi',
   ],
   'target_defaults': {
@@ skipping 67 matching lines @@
           'mac_bundle': 1,
           'product_name': 'ppGoogleNaClPluginChrome',
           'product_extension': 'plugin',
         }],
         ['OS=="mac" and mac_breakpad==1', {
           'variables': {
             # A real .dSYM is needed for dump_syms to operate on.
             'mac_real_dsym': 1,
           },
         }],
+        ['OS=="mac" and buildtype=="Official" and branding=="Chrome"', {
+          'xcode_settings': {
+            'OTHER_LDFLAGS': ['-fsanitize=address'],
+          },
+        }],
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
   ],
 }