Update from https://crrev.com/327068

build/android/gyp/util/build_utils.py

 # Copyright 2013 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.
 
 import ast
 import contextlib
 import fnmatch
 import json
 import os
 import pipes
 import re
 import shlex
 import shutil
 import subprocess
 import sys
 import tempfile
 import zipfile
 
 
 CHROMIUM_SRC = os.path.normpath(
     os.path.join(os.path.dirname(__file__),
                  os.pardir, os.pardir, os.pardir, os.pardir))
 COLORAMA_ROOT = os.path.join(CHROMIUM_SRC,
                              'third_party', 'colorama', 'src')
 # aapt should ignore OWNERS files in addition the default ignore pattern.
 AAPT_IGNORE_PATTERN = ('!OWNERS:!.svn:!.git:!.ds_store:!*.scc:.*:<dir>_*:' +
-                       '!CVS:!thumbs.db:!picasa.ini:!*~')
+                       '!CVS:!thumbs.db:!picasa.ini:!*~:!*.d.stamp')
 
 
 @contextlib.contextmanager
 def TempDir():
   dirname = tempfile.mkdtemp()
   try:
     yield dirname
   finally:
     shutil.rmtree(dirname)
 
@@ skipping 191 matching lines @@
   with zipfile.ZipFile(output, 'w') as outfile:
     for root, _, files in os.walk(base_dir):
       for f in files:
         path = os.path.join(root, f)
         archive_path = os.path.relpath(path, base_dir)
         CheckZipPath(archive_path)
         outfile.write(path, archive_path)
 
 
 def MergeZips(output, inputs, exclude_patterns=None):
+  added_names = set()
   def Allow(name):
     if exclude_patterns is not None:
       for p in exclude_patterns:
         if fnmatch.fnmatch(name, p):
           return False
     return True
 
   with zipfile.ZipFile(output, 'w') as out_zip:
     for in_file in inputs:
       with zipfile.ZipFile(in_file, 'r') as in_zip:
         for name in in_zip.namelist():
-          if Allow(name):
+          if name not in added_names and Allow(name):
             out_zip.writestr(name, in_zip.read(name))
+            added_names.add(name)
 
 
 def PrintWarning(message):
   print 'WARNING: ' + message
 
 
 def PrintBigWarning(message):
   print '*****     ' * 8
   PrintWarning(message)
   print '*****     ' * 8
@@ skipping 103 matching lines @@
       file_jsons[file_path] = ReadJson(file_path)
 
     expansion = file_jsons[file_path]
     for k in lookup_path[1:]:
       expansion = expansion[k]
 
     new_args[i] = arg[:match.start()] + str(expansion)
 
   return new_args