Enable BUILD file compilation of skia and dm with --config=android_arm.

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().
 
 # We start by adding some symbols to our namespace that BUILD.public calls.
 
 import glob
 import os
 import pprint
 import re
 
 def noop(*args, **kwargs):
   pass
 
+def select_simulator(d):
+  result = []
+  for k in d:
+    result.append("*** BEGIN %s ***" % k)
+    result.extend(d[k])
+    result.append("*** END %s ***" % k)
+  return result
+
 DOUBLE_STAR_RE = re.compile(r'/\*\*/')
 STAR_RE = re.compile(r'\*')
 DOUBLE_STAR_PLACEHOLDER = "xxxdoublestarxxx"
 STAR_PLACEHOLDER = "xxxstarxxx"
 
 # Returns a set of files that match pattern.
 def BUILD_glob_single(pattern):
   if pattern.find('**') < 0:
     # If pattern doesn't include **, glob.glob more-or-less does the right
     # thing.
@@ skipping 25 matching lines @@
   for pattern in include:
     files.update(BUILD_glob_single(pattern))
   for pattern in exclude:
     files.difference_update(BUILD_glob_single(pattern))
   return list(sorted(files))
 
 # With these namespaces, we can treat BUILD.public as if it were
 # Python code.  This pulls its variable definitions (SRCS, HDRS,
 # DEFINES, etc.) into local_names.
 global_names = {
-  'exports_files': noop,
   'cc_library': noop,
   'cc_test': noop,
+  'exports_files': noop,
   'glob': BUILD_glob,
-  'EXTERNAL_DEPS': [],
+  'select': select_simulator,
   'BASE_DIR': "",
+  'CONDITION_ANDROID': "CONDITION_ANDROID",
   'DM_EXTERNAL_DEPS': [],
+  '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)