Add 2d Canvas power test.

tools/perf/page_sets/mac_gpu_sites.py

Index: tools/perf/page_sets/mac_gpu_sites.py
diff --git a/tools/perf/page_sets/mac_gpu_sites.py b/tools/perf/page_sets/mac_gpu_sites.py
index f95e0994988288b5f2aa50854ad27acfecdb610b..f5e26c9cd0ce31458950285eb2842687f8dcf90f 100644
--- a/tools/perf/page_sets/mac_gpu_sites.py
+++ b/tools/perf/page_sets/mac_gpu_sites.py
@@ -42,6 +42,16 @@ class TrivialBlinkingCursorPage(page_module.Page):
         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):
@@ -49,10 +59,13 @@ class MacGpuTrivialPagesStorySet(story.StorySet):
     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):