Set the default ASan options for executables built with ASan on Linux.

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index d7c638e616b6d93296a328fcd5d68820a4eb1d55..e3c9dd1fa5bcccac716459f60f443016a7a9b9c3 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -1014,6 +1014,31 @@
         }],
       ],
     },
+    {
+      'target_name': 'sanitizer_options',
+      'type': 'static_library',
+       'variables': {
+         # Every target is going to depend on sanitizer_options, so allow
+         # this one to depend on itself.
+         'prune_self_dependency': 1,
+         # Do not let 'none' targets depend on this one, they don't need to.
+         'link_dependency': 1,
+       },
+      'sources': [
+        'debug/sanitizer_options.cc',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'cflags!': [
+        '-fsanitize=address',
+      ],
+      'direct_dependent_settings': {
+        'ldflags': [
+          '-Wl,-u_sanitizer_options_link_helper',
+        ],
+      },
+    },
   ],
   'conditions': [
     ['OS!="ios"', {