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

chrome/test/functional/ispy/server/update_mask_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 allow test mask updates."""
 
 import webapp2
 import re
 import sys
 import os
 
-from ..common import constants
-from ..common import image_tools
-from ..common import ispy_utils
+from common import constants
+from common import image_tools
+from common import ispy_utils
 
 import gs_bucket
 
 
 class UpdateMaskHandler(webapp2.RequestHandler):
   """Request handler to allow test mask updates."""
 
   def post(self):
     """Accepts post requests.
 
@@ skipping 25 matching lines @@
     # Get the failure namedtuple (which also computes the diff).
     failure = self.ispy.GetFailure(test_run, expectation)
     # Upload the new mask in place of the original.
     self.ispy.UpdateImage(
         ispy_utils.GetExpectationPath(expectation, 'mask.png'),
         image_tools.ConvertDiffToMask(failure.diff))
     # Now that there is no diff for the two images, remove the failure.
     self.ispy.RemoveFailure(test_run, expectation)
     # Redirect back to the sites list for the test run.
     self.redirect('/?test_run=%s' % test_run)