Add 2d Canvas power test.

tools/perf/page_sets/mac_gpu_sites.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.
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 
 class _NoGpuSharedPageState(shared_page_state.SharedPageState):
   def __init__(self, test, finder_options, story_set):
@@ skipping 24 matching lines @@
 class TrivialBlinkingCursorPage(page_module.Page):
 
   def __init__(self, page_set, shared_page_state_class):
     super(TrivialBlinkingCursorPage, self).__init__(
         url='file://trivial_sites/trivial_blinking_cursor.html',
         page_set=page_set,
         name=self.__class__.__name__ + shared_page_state_class.__name__,
         shared_page_state_class=shared_page_state_class)
 
 
+class TrivialCanvasPage(page_module.Page):
+
+  def __init__(self, page_set, shared_page_state_class):
+    super(TrivialCanvasPage, self).__init__(
+        url='file://trivial_sites/trivial_canvas.html',
+        page_set=page_set,
+        name=self.__class__.__name__ + shared_page_state_class.__name__,
+        shared_page_state_class=shared_page_state_class)
+
+
 class MacGpuTrivialPagesStorySet(story.StorySet):
 
   def __init__(self):
     super(MacGpuTrivialPagesStorySet, self).__init__()
     self.AddStory(TrivialScrollingPage(self, shared_page_state.SharedPageState))
     self.AddStory(TrivialBlinkingCursorPage(
         self, shared_page_state.SharedPageState))
+    self.AddStory(TrivialCanvasPage(self, shared_page_state.SharedPageState))
     self.AddStory(TrivialScrollingPage(self, _NoOverlaysSharedPageState))
     self.AddStory(TrivialBlinkingCursorPage(self, _NoOverlaysSharedPageState))
+    self.AddStory(TrivialCanvasPage(self, _NoOverlaysSharedPageState))
     self.AddStory(TrivialScrollingPage(self, _NoGpuSharedPageState))
     self.AddStory(TrivialBlinkingCursorPage(self, _NoGpuSharedPageState))
+    self.AddStory(TrivialCanvasPage(self, _NoGpuSharedPageState))
 
   @property
   def allow_mixed_story_states(self):
     # Return True here in order to be able to add the same tests with
     # a different SharedPageState.
     return True