[Findit] Support sending cookies for http requests.

tools/findit/common/utils.py

 # Copyright (c) 2011 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 re
 import sys
 
+from http_client_local import HttpClientLocal
+
 
 GIT_HASH_PATTERN = re.compile(r'^[0-9a-fA-F]{40}$')
 
 
 def GetOSName(platform_name=sys.platform):
   if platform_name == 'cygwin' or platform_name.startswith('win'):
     return 'win'
   elif platform_name.startswith('linux'):
     return 'unix'
   elif platform_name.startswith('darwin'):
     return 'mac'
   else:
     return platform_name
 
 
 def IsGitHash(revision):
   return GIT_HASH_PATTERN.match(str(revision))
+
+
+def GetHttpClient():
+  # TODO(stgao): return implementation for appengine when running on appengine.

[Martin Barbella, 2014/08/15 23:00:02]

Are two implementations necessary? Isn't setting COOKIE_FILE good enough for
this to work on app engine without any additional differences?

[stgao, 2014/08/15 23:11:03]

Yes, we need two different implementation.
On appengine, we don't have to sending cookie at all. The app is whitelised.

And we won't use urllib2. We will use url_fetch. 

+  return HttpClientLocal