Add Masonry to key silk cases.

tools/perf/page_sets/key_silk_cases.py

 # Copyright 2014 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.
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class KeySilkCasesPage(page_module.Page):
 
   def __init__(self, url, page_set, run_no_page_interactions):
@@ skipping 695 matching lines @@
         document.querySelector('html /deep/ topeka-quiz-fill-blank /deep/\
             input').value = 'arkinsaw';
         document.querySelector('html /deep/ topeka-quiz-fill-blank /deep/\
             input').fire('input');
         document.querySelector('html /deep/ topeka-quizzes /deep/ \
             paper-fab').fire('tap');''')
     action_runner.WaitForJavaScriptCondition('''
         window.topeka_page_transitions === 6''')
     interaction.End()
 
+class Masonry(KeySilkCasesPage):
+
+  """ Why: Popular layout hack. """
+
+  def __init__(self, page_set, run_no_page_interactions):
+    super(Masonry, self).__init__(
+      url='file://key_silk_cases/masonry.html',
+      page_set=page_set, run_no_page_interactions=run_no_page_interactions)
+
+  def PerformPageInteractions(self, action_runner):
+    interaction = action_runner.BeginInteraction('animation_interaction')
+    action_runner.ExecuteJavaScript('window.brick()')
+    action_runner.WaitForJavaScriptCondition('window.done')
+    interaction.End()
+
 
 class KeySilkCasesPageSet(page_set_module.PageSet):
 
   """ Pages hand-picked for project Silk. """
 
   def __init__(self, run_no_page_interactions=False):
     super(KeySilkCasesPageSet, self).__init__(
       user_agent_type='mobile',
       archive_data_file='data/key_silk_cases.json',
       bucket=page_set_module.PARTNER_BUCKET)
@@ skipping 24 matching lines @@
     # Times out on Windows; crbug.com/338838
     # self.AddUserStory(Page22(self, run_no_page_interactions))
     self.AddUserStory(Page23(self, run_no_page_interactions))
     self.AddUserStory(Page24(self, run_no_page_interactions))
     self.AddUserStory(Page25(self, run_no_page_interactions))
     self.AddUserStory(Page26(self, run_no_page_interactions))
     self.AddUserStory(SVGIconRaster(self, run_no_page_interactions))
     self.AddUserStory(UpdateHistoryState(self, run_no_page_interactions))
     self.AddUserStory(SilkFinance(self, run_no_page_interactions))
     self.AddUserStory(PolymerTopeka(self, run_no_page_interactions))
+    self.AddUserStory(Masonry(self, run_no_page_interactions))
 
     for page in self:
       assert (page.__class__.RunPageInteractions ==
               KeySilkCasesPage.RunPageInteractions), (
               'Pages in this page set must not override KeySilkCasesPage\' '
               'RunPageInteractions method.')