WebUI: Add GN rules for Vulcanize.

chrome/browser/resources/unpack_pak.py

Index: chrome/browser/resources/unpack_pak.py
diff --git a/chrome/browser/resources/unpack_pak.py b/chrome/browser/resources/unpack_pak.py
new file mode 100755
index 0000000000000000000000000000000000000000..ce6a993f7ed4edcee9bf2c6710e53ec626c0b99c
--- /dev/null
+++ b/chrome/browser/resources/unpack_pak.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+# Copyright 2016 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 os
+import re
+import sys
+
+
+_HERE_PATH = os.path.join(os.path.dirname(__file__))
+
+
+_SRC_PATH = os.path.normpath(os.path.join(_HERE_PATH, '..', '..', '..'))
+sys.path.append(os.path.join(_SRC_PATH, 'tools', 'grit'))
+from grit.format import data_pack
+
+
+def unpack(pak_path, out_path):
+  pak_dir = os.path.dirname(pak_path)
+  pak_id = os.path.splitext(os.path.basename(pak_path))[0]
+
+  data = data_pack.DataPack.ReadDataPack(pak_path)
+
+  # Associate numerical grit IDs to strings.
+  # For example 120045 -> 'IDR_SETTINGS_ABOUT_PAGE_HTML'
+  resource_ids = dict()
+  resources_path = os.path.join(pak_dir, 'grit', pak_id + '.h')
+  with open(resources_path) as resources_file:
+    for line in resources_file:
+      res = re.match('#define ([^ ]+) (\d+)', line)
+      if res:
+        resource_ids[int(res.group(2))] = res.group(1)
+  assert resource_ids
+
+  # Associate numerical string IDs to files.
+  resource_filenames = dict()
+  resources_map_path = os.path.join(pak_dir, 'grit', pak_id + '_map.cc')
+  with open(resources_map_path) as resources_map:
+    for line in resources_map:
+      res = re.match('  {"([^"]+)", ([^}]+)', line)
+      if res:
+        resource_filenames[res.group(2)] = res.group(1)
+  assert resource_filenames
+
+  # Extract packed files, while preserving directory structure.
+  for (resource_id, text) in data.resources.iteritems():
+    filename = resource_filenames[resource_ids[resource_id]]
+    dirname = os.path.join(out_path, os.path.dirname(filename))
+    if not os.path.exists(dirname):
+      os.makedirs(dirname)
+    with open(os.path.join(out_path, filename), 'w') as file:
+      file.write(text)