If the 'asan' GYP variable is set to 1 on Mac, do not strip the __asan_init symbol from the binar...

chrome/chrome.gyp

 # Copyright (c) 2011 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': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 1020 matching lines @@
               'variables': {
                 # A real .dSYM is needed for dump_syms to operate on.
                 'mac_real_dsym': 1,
               },
               'xcode_settings': {
                 # With mac_real_dsym set, strip_from_xcode won't be used.
                 # Specify CHROMIUM_STRIP_SAVE_FILE directly to Xcode.
                 'STRIPFLAGS': '-s $(CHROMIUM_STRIP_SAVE_FILE)',
               },
             }],
+            ['asan==1', {
+              'xcode_settings': {
+                # Override the outer definition of CHROMIUM_STRIP_SAVE_FILE.
+                'CHROMIUM_STRIP_SAVE_FILE': 'app/app_asan.saves',
+              },
+            }],
           ],
         },  # target helper_app
         {
           # This produces the app mode loader, but not as a bundle. Chromium
           # itself is responsible for producing bundles.
           'target_name': 'app_mode_app',
           'type': 'executable',
           'product_name': '<(mac_product_name) App Mode Loader',
           'sources': [
             'app/app_mode_loader_mac.mm',
@@ skipping 686 matching lines @@
             'destination': '<(PRODUCT_DIR)',
             'files': [
               '<(INTERMEDIATE_DIR)/repack/chrome.pak'
             ],
           },
         ],
       }],  # targets
     }],  # OS != "mac"
   ],  # 'conditions'
 }