tools: Add tough_fast_scrolling_cases page set.

tools/perf/benchmarks/smoothness.py

 # Copyright 2013 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 benchmarks import silk_flags
 import page_sets
 from measurements import smoothness
 from telemetry import benchmark
 
 
@@ skipping 111 matching lines @@
 
 @benchmark.Enabled('android')
 class SmoothnessGpuRasterizationPolymer(benchmark.Benchmark):
   """Measures rendering statistics for the Polymer cases with GPU rasterization
   """
   tag = 'gpu_rasterization'
   test = smoothness.Smoothness
   page_set = page_sets.PolymerPageSet
   def CustomizeBrowserOptions(self, options):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
+
+class SmoothnessToughFastScrollingCases(benchmark.Benchmark):

[reveman, 2014/10/30 22:48:48]

This enables this new benchmark on all devices. Not sure that's a good idea. Let
me know what you think.

[ilja, 2014/10/31 04:38:50]

I think that is fine for ChromeOS. But I also think we would need to hook it up
first to get it running. So, maybe keep a few days between landing this and
landing the change that you want to benchmark?

[reveman, 2014/10/31 16:36:52]

I'm mostly interested in this as mechanism to prevent regressions but if we can
get this landed and enabled today then we can have it run over the weekend and I
can enable the feature that will improve this early next week. I'd rather not
enable this too close to the branch point..

[ilja, 2014/10/31 20:18:29]

I hooked this test up for ChromeOS in anticipation. As soon as you land this you
should start seeing results here
https://wmatrix.googleplex.com/unfiltered?hide_missing=True&releases=tot&test...

Right now it is red as the test obviously doesn't exist yet.

+  test = smoothness.Smoothness
+  page_set = page_sets.ToughFastScrollingCasesPageSet