Use hermetic timestamps in apkbuilder.py and refactor helper function

build/android/gyp/apkbuilder.py

Index: build/android/gyp/apkbuilder.py
diff --git a/build/android/gyp/apkbuilder.py b/build/android/gyp/apkbuilder.py
index c44173f0f941f21c179ebd68e4bdd4938206a17b..ffe4740da69e02755517bd4aeb66892b9bc47fb7 100755
--- a/build/android/gyp/apkbuilder.py
+++ b/build/android/gyp/apkbuilder.py
@@ -87,16 +87,13 @@ def _AddAssets(apk, paths, disable_compression=False):
   """
   # Group all uncompressed assets together in the hope that it will increase
   # locality of mmap'ed files.
-  for target_compress_type in (zipfile.ZIP_STORED, zipfile.ZIP_DEFLATED):
+  for target_compress in (False, True):
     for path in paths:
       src_path, dest_path = _SplitAssetPath(path)
 
-      compress_type = zipfile.ZIP_DEFLATED
-      if disable_compression or (
-          os.path.splitext(src_path)[1] in _NO_COMPRESS_EXTENSIONS):
-        compress_type = zipfile.ZIP_STORED
-
-      if target_compress_type == compress_type:
+      compress = not disable_compression and (
+          os.path.splitext(src_path)[1] not in _NO_COMPRESS_EXTENSIONS)
+      if target_compress == compress:
         apk_path = 'assets/' + dest_path
         try:
           apk.getinfo(apk_path)
@@ -104,7 +101,8 @@ def _AddAssets(apk, paths, disable_compression=False):
           raise Exception('Multiple targets specified the asset path: %s' %
                           apk_path)
         except KeyError:
-          apk.write(src_path, apk_path, compress_type)
+          build_utils.AddToZipHermetic(apk, apk_path, src_path=src_path,
+                                       compress=compress)
 
 
 def main(args):
@@ -140,13 +138,16 @@ def main(args):
         _AddAssets(apk, options.uncompressed_assets, disable_compression=True)
         for path in native_libs:
           basename = os.path.basename(path)
-          apk.write(path, 'lib/%s/%s' % (options.android_abi, basename))
+          apk_path = 'lib/%s/%s' % (options.android_abi, basename)
+          build_utils.AddToZipHermetic(apk, apk_path, src_path=path)
         if options.create_placeholder_lib:
           # Make it non-empty so that its checksum is non-zero and is not
           # ignored by md5_check.
-          apk.writestr('lib/%s/libplaceholder.so' % options.android_abi, ':-)')
+          apk_path = 'lib/%s/libplaceholder.so' % options.android_abi
+          build_utils.AddToZipHermetic(apk, apk_path, data=':)')
         if options.dex_file:
-          apk.write(options.dex_file, 'classes.dex')
+          build_utils.AddToZipHermetic(apk, 'classes.dex',
+                                       src_path=options.dex_file)
 
       shutil.move(tmp_apk, options.output_apk)
     finally: