Fix Python imported modules depfile generation

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
 
 # Some clients do not add //build/android/gyp to PYTHONPATH.
 import md5_check  # pylint: disable=relative-import
 
-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,
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
+from pylib import constants
+
+COLORAMA_ROOT = os.path.join(constants.DIR_SOURCE_ROOT,
                              '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:!*~:!*.d.stamp')
 HERMETIC_TIMESTAMP = (2001, 1, 1, 0, 0, 0)
 HERMETIC_FILE_ATTR = (0644 << 16L)
 
 
 @contextlib.contextmanager
 def TempDir():
@@ skipping 296 matching lines @@
   """Gets the paths of imported non-system python modules.
 
   A path is assumed to be a "system" import if it is outside of chromium's
   src/. The paths will be relative to the current directory.
   """
   module_paths = (m.__file__ for m in sys.modules.itervalues()
                   if m is not None and hasattr(m, '__file__'))
 
   abs_module_paths = map(os.path.abspath, module_paths)
 
+  assert os.path.isabs(constants.DIR_SOURCE_ROOT)
   non_system_module_paths = [
-      p for p in abs_module_paths if p.startswith(CHROMIUM_SRC)]
+      p for p in abs_module_paths if p.startswith(constants.DIR_SOURCE_ROOT)]
   def ConvertPycToPy(s):
     if s.endswith('.pyc'):
       return s[:-1]
     return s
 
   non_system_module_paths = map(ConvertPycToPy, non_system_module_paths)
   non_system_module_paths = map(os.path.relpath, non_system_module_paths)
   return sorted(set(non_system_module_paths))
 
 
@@ skipping 91 matching lines @@
 
   md5_check.CallAndRecordIfStale(
       on_stale_md5,
       record_path=record_path,
       input_paths=input_paths,
       input_strings=input_strings,
       output_paths=output_paths,
       force=force,
       pass_changes=True)