telemetry, mac: Add more simple scrolling power tests.

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):
+    super(_NoGpuSharedPageState, self).__init__(
+      test, finder_options, story_set)
+    finder_options.browser_options.AppendExtraBrowserArgs(
+      ['--no-gpu'])
+
+
+class _NoOverlaysSharedPageState(shared_page_state.SharedPageState):
+  def __init__(self, test, finder_options, story_set):
+    super(_NoOverlaysSharedPageState, self).__init__(
+      test, finder_options, story_set)
+    finder_options.browser_options.AppendExtraBrowserArgs(
+      ['--disable-mac-overlays'])
+
+
+class TrivialScrollingPage(page_module.Page):
+
+  def __init__(self, page_set, shared_page_state_class):
+    super(TrivialScrollingPage, self).__init__(
+        url='file://trivial_sites/trivial_scrolling_page.html',
+        page_set=page_set,
+        name=self.__class__.__name__ + shared_page_state_class.__name__,
+        shared_page_state_class=shared_page_state_class)
+
+
+class MacGpuTrivialScrollStorySet(story.StorySet):
+
+  def __init__(self):
+    super(MacGpuTrivialScrollStorySet, self).__init__()
+    self.AddStory(TrivialScrollingPage(self, shared_page_state.SharedPageState))
+    self.AddStory(TrivialScrollingPage(self, _NoOverlaysSharedPageState))
+    self.AddStory(TrivialScrollingPage(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