[I-Spy] Add support for rebaselining expectations from the web UI.

chrome/test/functional/ispy/server/image_handler.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.
 
 """Request handler to display an image from Google Cloud Storage."""
 
 import json
 import os
 import sys
 import webapp2
 
-from ..common import cloud_bucket
-from ..common import constants
+from common import cloud_bucket
+from common import constants
 
 import gs_bucket
 
 
 class ImageHandler(webapp2.RequestHandler):
   """A request handler to avoid the Same-Origin problem in the debug view."""
 
   def get(self):
     """Handles get requests to the ImageHandler.
 
     GET Parameters:
       file_path: A path to an image resource in Google Cloud Storage.
     """
     file_path = self.request.get('file_path')
     if not file_path:
       self.error(404)
       return
     bucket = gs_bucket.GoogleCloudStorageBucket(constants.BUCKET)
     try:
       image = bucket.DownloadFile(file_path)
     except cloud_bucket.FileNotFoundError:
       self.error(404)
     else:
       self.response.headers['Content-Type'] = 'image/png'
       self.response.out.write(image)