Add sk_careful_memcpy to catch undefined behavior in memcpy.

gyp/sfntly.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.
 {
   'targets': [
     {
       'target_name': 'sfntly',
       'type': 'static_library',
       'includes': [
         'common_conditions.gypi',
@@ skipping 15 matching lines @@
       ],
       'include_dirs': [
         '<(sfntly_src_path)',
       ],
       'defines': [
         'SFNTLY_NO_EXCEPTION',
       ],
       'dependencies' : [
         'icu.gyp:icuuc',
       ],
+      # Disable any sanitizers we might be using.
+      'ldflags!': [ '-fsanitize=<(skia_sanitizer)' ],
+      'cflags!':  [ '-fsanitize=<(skia_sanitizer)' ],
       'conditions': [
         [ 'skia_os == "win"',
           {
             'defines': [ 'WIN32', ],
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'AdditionalOptions': [ '/EHsc' ],
               },
             },
           }
         ],
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]',
           { 'link_settings': { 'libraries': [ '-lpthread', ], }, },
         ],
       ],
       # TODO(jschuh): http://crbug.com/167187
       'msvs_disabled_warnings': [ 4267, 4244 ],
     },
   ]
 }