[pinpoint] Gerrit patch support.

dashboard/dashboard/pinpoint/models/change/change.py

 # Copyright 2016 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 collections
 import itertools
 
 from dashboard.pinpoint.models.change import commit as commit_module
 from dashboard.pinpoint.models.change import patch as patch_module
 
@@ skipping 51 matching lines @@
     return {
         'commits': [commit.AsDict() for commit in self.commits],
         'patch': self.patch.AsDict() if self.patch else None,
     }
 
   @classmethod
   def FromDict(cls, data):
     commits = tuple(commit_module.Commit.FromDict(commit)
                     for commit in data['commits'])
     if 'patch' in data:
-      patch = patch_module.Patch.FromDict(data['patch'])
+      patch = patch_module.FromDict(data['patch'])
     else:
       patch = None
 
     return cls(commits, patch=patch)
 
   @classmethod
   def Midpoint(cls, change_a, change_b):
     """Returns a Change halfway between the two given Changes.
 
     This function does two passes over the Changes' Commits:
@@ skipping 124 matching lines @@
           if not _FindCommitWithRepository(commits_b, dep.repository))
 
   return commits_midpoint
 
 
 def _FindCommitWithRepository(commits, repository):
   for commit in commits:
     if commit.repository == repository:
       return commit
   return None