[pinpoint] Change refactor.

dashboard/dashboard/pinpoint/handlers/new.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 json
 import webapp2
 
 from dashboard.api import api_auth
 from dashboard.pinpoint.handlers import quest_generator
 from dashboard.pinpoint.models import change
@@ skipping 16 matching lines @@
     self.response.out.write(json.dumps({'error': message}))
 
   @api_auth.Authorize
   def _CreateJob(self):
     """Start a new Pinpoint job."""
     repeat_count = self.request.get('repeat_count')
     auto_explore = self.request.get('auto_explore') == '1'
     bug_id = self.request.get('bug_id')
 
     change_1 = {
-        'base_commit': {
+        'commits': [{
             'repository': self.request.get('start_repository'),
             'git_hash': self.request.get('start_git_hash')
-        }
+        }]
     }
 
     change_2 = {
-        'base_commit': {
+        'commits': [{
             'repository': self.request.get('end_repository'),
             'git_hash': self.request.get('end_git_hash')
-        }
+        }]
     }
 
     # Validate arguments and convert them to canonical internal representation.
     arguments, quests = quest_generator.GenerateQuests(self.request)
     repeat_count = _ValidateRepeatCount(repeat_count)
     bug_id = _ValidateBugId(bug_id)
     changes = _ValidateChanges(change_1, change_2)
 
     # Create job.
     job = job_module.Job.New(
@@ skipping 37 matching lines @@
     return None
 
   try:
     return int(bug_id)
   except ValueError:
     raise ValueError(_ERROR_BUG_ID)
 
 
 def _ValidateChanges(change_1, change_2):
   return (change.Change.FromDict(change_1), change.Change.FromDict(change_2))