[Findit] Make Findit more robust.

tools/findit/common/http_client.py

 # Copyright (c) 2014 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.
 
 class HttpClient(object):
   """Represent a http client for sending request to a http[s] server.
 
   If cookies need to be sent, they should be in a file pointed to by
   COOKIE_FILE in the environment.
   """
 
   @staticmethod
-  def Get(url, params={}, timeout=None):
+  def Get(url, params={}, timeout=60, retries=5, retry_interval=0.5,
+          retry_if_not=None):
     """Send a GET request to the given url with the given parameters.
 
+    Args:
+      url: the url to send request to.
+      params: parameters to send as part of the http request.
+      timeout: timeout for the http request, default is 60 seconds.
+      retries: indicate how many retries before failing, default is 5.
+      retry_interval: interval in second to wait before retry, default is 0.5.
+      retry_if_not: a http status code. If set, retry only when the failed http
+                    status code is a different value.
+
     Returns:
       (status_code, data)
       state_code: the http status code in the response.
       data: the body of the response.
     """
     raise NotImplemented()