[Android] Support building standalone APK in component build

build/android/gyp/finalize_apk.py

 #!/usr/bin/env python
 #
 # 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.
 """Signs and zipaligns APK.
 
 """
 
 import optparse
 import os
 import shutil
 import sys
+import tempfile
 
 from util import build_utils
 
 def SignApk(keystore_path, unsigned_path, signed_path):
-  intermediate_path = unsigned_path + '.copy'
-  shutil.copy(unsigned_path, intermediate_path)
+  shutil.copy(unsigned_path, signed_path)
   sign_cmd = [
       'jarsigner',
       '-sigalg', 'MD5withRSA',
       '-digestalg', 'SHA1',
       '-keystore', keystore_path,
       '-storepass', 'chromium',
-      intermediate_path,
+      signed_path,
       'chromiumdebugkey',
     ]
   build_utils.CheckCallDie(sign_cmd)
-  shutil.move(intermediate_path, signed_path)
 
 
 def AlignApk(android_sdk_root, unaligned_path, final_path):
   align_cmd = [
       os.path.join(android_sdk_root, 'tools', 'zipalign'),
       '-f', '4',  # 4 bytes
       unaligned_path,
       final_path,
       ]
   build_utils.CheckCallDie(align_cmd)
 
 
 def main(argv):
   parser = optparse.OptionParser()
 
   parser.add_option('--android-sdk-root', help='Android sdk root directory.')
   parser.add_option('--unsigned-apk-path', help='Path to input unsigned APK.')
   parser.add_option('--final-apk-path',
       help='Path to output signed and aligned APK.')
   parser.add_option('--keystore-path', help='Path to keystore for signing.')
   parser.add_option('--stamp', help='Path to touch on success.')
 
   # TODO(newt): remove this once http://crbug.com/177552 is fixed in ninja.
   parser.add_option('--ignore', help='Ignored.')
 
   options, _ = parser.parse_args()
 
-  signed_apk_path = options.unsigned_apk_path + '.signed.apk'
-  SignApk(options.keystore_path, options.unsigned_apk_path, signed_apk_path)
-  AlignApk(options.android_sdk_root, signed_apk_path, options.final_apk_path)
+  with tempfile.NamedTemporaryFile() as intermediate_file:
+    signed_apk_path = intermediate_file.name
+    SignApk(options.keystore_path, options.unsigned_apk_path, signed_apk_path)
+    AlignApk(options.android_sdk_root, signed_apk_path, options.final_apk_path)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))