Add .apk to compare_build_artifacts.py.

scripts/slave/recipe_modules/isolate/resources/compare_build_artifacts.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 """Compare the artifacts from two builds."""
 
 import difflib
 import json
 import optparse
 import os
 import struct
 import sys
 import time
 
 
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 
 
 def get_files_to_compare(build_dir):
   """Get the list of files to compare."""
   allowed = frozenset(
-      ('', '.app', '.dll', '.dylib', '.exe', '.nexe', '.so'))
+      ('', '.apk', '.app', '.dll', '.dylib', '.exe', '.nexe', '.so'))
 
   def check(f):
     if not os.path.isfile(f):
       return False
     if os.path.basename(f).startswith('.'):
       return False
     ext = os.path.splitext(f)[1]
     if ext == '.isolated':
       return True
     return ext in allowed and os.access(f, os.X_OK)
@@ skipping 140 matching lines @@
     parser.error('--first-build-dir is required')
   if not options.second_build_dir:
     parser.error('--second-build-dir is required')
 
   return compare_build_artifacts(options.first_build_dir,
                                  options.second_build_dir)
 
 
 if __name__ == '__main__':
   sys.exit(main())