For BUILD.public, let SkPreConfig.h set SK_RELEASE based on NDEBUG.

tools/BUILD_simulator.py

 #!/usr/bin/env python
 #
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script does a very rough simulation of BUILD file expansion,
 # mostly to see the effects of glob().
 
@@ skipping 61 matching lines @@
 # DEFINES, etc.) into local_names.
 global_names = {
   'cc_library': noop,
   'cc_test': noop,
   'exports_files': noop,
   'glob': BUILD_glob,
   'select': select_simulator,
   'BASE_DIR': "",
   'CONDITION_ANDROID': "CONDITION_ANDROID",
   'DM_EXTERNAL_DEPS': [],
+  'EXTERNAL_DEPS_ALL': [],
   'EXTERNAL_DEPS_ANDROID': [],
   'EXTERNAL_DEPS_UNIX': [],
 }
 local_names = {}
 execfile('BUILD.public', global_names, local_names)
 
 with open('tools/BUILD.public.expected', 'w') as out:
   print >>out, "This file is auto-generated by tools/BUILD_simulator.py."
   print >>out, "It expands BUILD.public to make it easy to see changes."
   for name, value in sorted(local_names.items()):
     print >>out, name, '= ',
     pprint.pprint(value, out)