[Dashboard] Get or create ancestors in add_histograms_queue

dashboard/dashboard/add_histograms_test.py

 # Copyright 2017 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 base64
 import json
 import urlparse
 import webapp2
 import webtest
 
 from dashboard import add_histograms
 from dashboard.common import testing_common
 from tracing.value import histogram as histogram_module
 
 
 class AddHistogramsTest(testing_common.TestCase):
   def setUp(self):
     super(AddHistogramsTest, self).setUp()
     app = webapp2.WSGIApplication([
         ('/add_histograms', add_histograms.AddHistogramsHandler)])
     self.testapp = webtest.TestApp(app)
     testing_common.SetIsInternalUser('foo@bar.com', True)
     self.SetCurrentUser('foo@bar.com', is_admin=True)
 
-  def testPostSetsTestPathAndRevision(self):
+  def testPostHistogramSetsTestPathAndRevision(self):
     data = json.dumps([
         {
             'benchmarkName': 'benchmark',
             'canonicalUrl': '',
             'guid': '0bc1021b-8107-4db7-bc8c-49d7cf53c5ae',
             'label': '',
             'legacyTIRLabel': '',
             'storyDisplayName': 'story',
             'type': 'TelemetryInfo'
         }, {
@@ skipping 116 matching lines @@
     histograms.AddSharedDiagnostic('foo', histogram_module.BuildbotInfo({
         'displayMasterName': 'dmn',
         'displayBotName': 'dbn',
         'buildbotMasterName': 'bbmn',
         'buildbotName': 'bbn',
         'buildNumber': 42,
         'logUri': 'uri',
     }))
     add_histograms.InlineDenseSharedDiagnostics(histograms)
     self.assertFalse(histogram.diagnostics['foo'].is_inline)