Add scrolling power test.

tools/perf/benchmarks/power.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 core import perf_benchmark
 
 from benchmarks import silk_flags
 from measurements import power
 import page_sets
 from telemetry import benchmark
@@ skipping 160 matching lines @@
     return 'power.gpu_rasterization.top_25'
 
   def CreateStorySet(self, _):
     # Exclude techcrunch.com. It is not suitable for this benchmark because it
     # does not consistently become quiescent within 60 seconds.
     stories = self.page_set()
     found = next((x for x in stories if 'techcrunch.com' in x.url), None)
     if found:
       stories.RemoveStory(found)
     return stories
+
+
+@benchmark.Enabled('mac')
+class PowerScrollingTrivialPage(perf_benchmark.PerfBenchmark):
+  """Scroll a trivial page and measure power consumption."""
+  test = power.QuiescentPower
+  page_set = page_sets.TrivialScrollStorySet
+
+  @classmethod
+  def Name(cls):
+    return 'power.trivial_scroll'