[Android] Fix resource_sizes for APKs that have no native library.

build/android/resource_sizes.py

 #!/usr/bin/python
 # 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.
 
 """Prints the size of each given file and optionally computes the size of
    libchrome.so without the dependencies added for building with android NDK.
    Also breaks down the contents of the APK to determine the installed size
    and assign size contributions to different classes of file.
 """
@@ skipping 281 matching lines @@
     return iter(self._zip_infos)
 
   def GetNumEntries(self):
     return len(self._zip_infos)
 
   def FindByPattern(self, pattern):
     return next((i for i in self._zip_infos if re.match(pattern, i.filename)),
                 None)
 
   def FindLargest(self):
+    if not self._zip_infos:
+      return None
     return max(self._zip_infos, key=lambda i: i.file_size)
 
   def ComputeZippedSize(self):
     return sum(i.compress_size for i in self._zip_infos)
 
   def ComputeUncompressedSize(self):
     return sum(i.file_size for i in self._zip_infos)
 
   def ComputeExtractedSize(self):
     ret = 0
@@ skipping 468 matching lines @@
           args.apk, tools_prefix, chartjson=chartjson)
   if chartjson:
     results_path = os.path.join(args.output_dir, 'results-chart.json')
     logging.critical('Dumping json to %s', results_path)
     with open(results_path, 'w') as json_file:
       json.dump(chartjson, json_file)
 
 
 if __name__ == '__main__':
   sys.exit(main())