Add trivial animation page to trivial_sites perf benchmark.

tools/perf/page_sets/trivial_sites.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.
 
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 
 class _BasePage(page_module.Page):
@@ skipping 100 matching lines @@
                measure_memory):
     super(TrivialGifPage, self).__init__(
         url='file://trivial_sites/trivial_gif.html',
         page_set=page_set,
         name=self.__class__.__name__ + shared_page_state_class.__name__,
         shared_page_state_class=shared_page_state_class,
         wait_in_seconds=wait_in_seconds,
         measure_memory=measure_memory)
 
 
+class TrivialAnimationPage(_BasePage):
+
+  def __init__(self, page_set, shared_page_state_class, wait_in_seconds,
+               measure_memory):
+    super(TrivialAnimationPage, self).__init__(
+        url='file://trivial_sites/trivial_animation.html',
+        page_set=page_set,
+        name=self.__class__.__name__ + shared_page_state_class.__name__,
+        shared_page_state_class=shared_page_state_class,
+        wait_in_seconds=wait_in_seconds,
+        measure_memory=measure_memory)
+
+
 class TrivialSitesStorySet(story.StorySet):
   def __init__(self, shared_state = shared_page_state.SharedPageState,
                wait_in_seconds=0, measure_memory=False):
     # Wait is time to wait_in_seconds on page in seconds.
     super(TrivialSitesStorySet, self).__init__(
         cloud_storage_bucket=story.PUBLIC_BUCKET)
     self.AddStory(TrivialScrollingPage(
         self, shared_state, wait_in_seconds, measure_memory))
     self.AddStory(TrivialBlinkingCursorPage(
         self, shared_state, wait_in_seconds, measure_memory))
     self.AddStory(TrivialCanvasPage(
         self, shared_state, wait_in_seconds, measure_memory))
     self.AddStory(TrivialWebGLPage(
         self, shared_state, wait_in_seconds, measure_memory))
     self.AddStory(TrivialBlurAnimationPage(
         self, shared_state, wait_in_seconds, measure_memory))
     self.AddStory(TrivialFullscreenVideoPage(
         self, shared_state, wait_in_seconds, measure_memory))
     self.AddStory(TrivialGifPage(
         self, shared_state, wait_in_seconds, measure_memory))
+    self.AddStory(TrivialAnimationPage(
+        self, shared_state, wait_in_seconds, measure_memory))