Fix system env being overriden with empty env in lint.py

build/android/gyp/lint.py

 #!/usr/bin/env python
 #
 # Copyright (c) 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.
 
 """Runs Android's lint tool."""
 
 
 import argparse
@@ skipping 152 matching lines @@
     # sibling res/ and src/ directories (which should be pass explicitly if they
     # are to be included).
     if manifest_path:
       os.symlink(os.path.abspath(manifest_path),
                  os.path.join(project_dir, 'AndroidManifest.xml'))
     cmd.append(project_dir)
 
     if os.path.exists(result_path):
       os.remove(result_path)
 
-    env = {}
+    env = os.environ.copy()
     stderr_filter = None
     if cache_dir:
       env['_JAVA_OPTIONS'] = '-Duser.home=%s' % _RebasePath(cache_dir)
       # When _JAVA_OPTIONS is set, java prints to stderr:
       # Picked up _JAVA_OPTIONS: ...
       #
       # We drop all lines that contain _JAVA_OPTIONS from the output
       stderr_filter = lambda l: re.sub(r'.*_JAVA_OPTIONS.*\n?', '', l)
 
     try:
@@ skipping 173 matching lines @@
                             silent=args.silent),
         args,
         input_paths=input_paths,
         input_strings=input_strings,
         output_paths=output_paths,
         depfile_deps=classpath)
 
 
 if __name__ == '__main__':
   sys.exit(main())